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Kaempfle M, Bergmann M, Koelle P, Hartmann K. High Performance Liquid Chromatography Analysis and Description of Purine Content of Diets Suitable for Dogs with Leishmania Infection during Allopurinol Treatment-A Pilot Trial. Animals (Basel) 2023; 13:3060. [PMID: 37835666 PMCID: PMC10571740 DOI: 10.3390/ani13193060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 09/13/2023] [Accepted: 09/24/2023] [Indexed: 10/15/2023] Open
Abstract
Reducing the alimentary purine intake contributes to the prevention of purine (especially xanthine) urolith formation, a common adverse effect of allopurinol treatment in dogs with Leishmania infections. Analyses of the purine content are not required in order to advertise a diet as low in purine. Due to different analytical methods, data provided on purine content are barely comparable. The aim of this study was to investigate the total purine content of 12 different dog diets. For this, the purine bases adenine, guanine, xanthine, and hypoxanthine were determined by standardised high performance liquid chromatography in commercially available urinary diets (n = 4), kidney diets (n = 2), low protein diets (n = 3), 1 vegan diet, 1 regular diet for healthy adult dogs, and 1 homemade low purine diet. Total purine amounts ranged between 10.2 and 90.9 mg/100 g of dry matter. The daily purine intake calculated for a 20 kg standard dog with the analysed diets ranged between 21.9 and 174.7 mg. The lowest daily purine intakes were achieved by 2 urinary urate diets, followed by the homemade diet. Differences in the purine content of commercially available diets need to be considered. Awareness has to be raised when selecting diets for dogs with Leishmania infections during allopurinol treatment in order to minimise the risk of urolith formation.
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Affiliation(s)
- Melanie Kaempfle
- LMU Small Animal Clinic, Centre for Clinical Veterinary Medicine, LMU Munich, 80539 Munich, Germany; (M.B.); (P.K.); (K.H.)
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Pedrinelli V, Teixeira FA, Queiroz MR, Brunetto MA. Environmental impact of diets for dogs and cats. Sci Rep 2022; 12:18510. [PMID: 36396966 PMCID: PMC9672041 DOI: 10.1038/s41598-022-22631-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 10/18/2022] [Indexed: 11/18/2022] Open
Abstract
Food production is responsible for almost one-quarter of the environmental impact and, therefore, its importance regarding sustainability should not be overlooked. The companion animal population is increasing, and an important part of pet food is composed of ingredients that have a high environmental impact. This study aimed to evaluate the impact of dry, wet, and homemade pet diets on greenhouse gas emission, land use, acidifying emission, eutrophying emissions, freshwater withdrawals, and stress-weighted water use. The wet diets were responsible for the highest impact, and dry diets were the type of diet that least impacted the environment, with a positive correlation between the metabolizable energy provided by animal ingredients and the environmental impact. It is necessary to consider the environmental impact of pet food since it is significant, and the population of pets tends to increase.
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Affiliation(s)
- Vivian Pedrinelli
- grid.11899.380000 0004 1937 0722School of Veterinary Medicine and Animal Science, University of Sao Paulo, Sao Paulo, Brazil
| | - Fabio A. Teixeira
- grid.11899.380000 0004 1937 0722School of Veterinary Medicine and Animal Science, University of Sao Paulo, Sao Paulo, Brazil
| | - Mariana R. Queiroz
- grid.11899.380000 0004 1937 0722School of Veterinary Medicine and Animal Science, University of Sao Paulo, Sao Paulo, Brazil
| | - Marcio A. Brunetto
- grid.11899.380000 0004 1937 0722School of Veterinary Medicine and Animal Science, University of Sao Paulo, Sao Paulo, Brazil
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3
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Kovaříková S, Maršálek P, Vrbová K. Cystinuria in Dogs and Cats: What Do We Know after Almost 200 Years? Animals (Basel) 2021; 11:2437. [PMID: 34438894 PMCID: PMC8388795 DOI: 10.3390/ani11082437] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 08/08/2021] [Accepted: 08/13/2021] [Indexed: 11/18/2022] Open
Abstract
The purpose of this review is to summarize current knowledge on canine and feline cystinuria from available scientific reports. Cystinuria is an inherited metabolic defect characterized by abnormal intestinal and renal amino acid transport in which cystine and the dibasic amino acids ornithine, lysine, and arginine are involved (COLA). At a normal urine pH, ornithine, lysine, and arginine are soluble, but cysteine forms a dimer, cystine, which is relatively insoluble, resulting in crystal precipitation. Mutations in genes coding COLA transporter and the mode of inheritance were identified only in some canine breeds. Cystinuric dogs may form uroliths (mostly in lower urinary tract) which are associated with typical clinical symptoms. The prevalence of cystine urolithiasis is much higher in European countries (up to 14% according to the recent reports) when compared to North America (United States and Canada) where it is approximately 1-3%. Cystinuria may be diagnosed by the detection of cystine urolithiasis, cystine crystalluria, assessment of amino aciduria, or using genetic tests. The management of cystinuria is aimed at urolith removal or dissolution which may be reached by dietary changes or medical treatment. In dogs with androgen-dependent cystinuria, castration will help. In cats, cystinuria occurs less frequently in comparison with dogs.
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Affiliation(s)
- Simona Kovaříková
- Department of Animal Protection and Welfare and Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences, 612 42 Brno, Czech Republic;
| | - Petr Maršálek
- Department of Animal Protection and Welfare and Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences, 612 42 Brno, Czech Republic;
| | - Kateřina Vrbová
- Faculty of Veterinary Medicine, University of Veterinary Sciences, 612 42 Brno, Czech Republic;
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Bijsmans E, Quéau Y, Biourge V. Increasing Dietary Potassium Chloride Promotes Urine Dilution and Decreases Calcium Oxalate Relative Supersaturation in Healthy Dogs and Cats. Animals (Basel) 2021; 11:ani11061809. [PMID: 34204431 PMCID: PMC8234551 DOI: 10.3390/ani11061809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 06/09/2021] [Accepted: 06/10/2021] [Indexed: 11/16/2022] Open
Abstract
Urine dilution is a strategy used to decrease the risk of crystallization in cats and dogs at risk of urolithiasis. Sodium chloride has been used in prescription diets to effectively promote urine dilution, but the effect of the salt-substitute potassium chloride (KCl) on urine parameters has not been extensively investigated. Two diets differing only in KCl (Diet A; K 0.44 g/MJ, Diet B; K 1.03 g/MJ) were fed to 17 cats and 22 dogs for seven days, followed by three days of urine collection. Urinary ion concentrations were determined by ionic chromatography, and SUPERSAT software was used to calculate the relative supersaturation (RSS) value for struvite and calcium oxalate. Water intake and urine volume increased, and USG decreased on diet B (p < 0.001). Urine concentration of potassium increased on diet B, but concentrations of all other ions did not change or decrease in line with urine dilution. Calcium oxalate RSS decreased on diet B (p < 0.05). This short-term study showed that increased dietary KCl in a dry extruded diet effectively dilutes the urine of cats and dogs and therefore offers a novel nutritional strategy for the prevention of urolithiasis. This finding is of interest for patients that would benefit from dietary sodium restriction.
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Niedermeyer GM, Hare E, Brunker LK, Berk RA, Kelsey KM, Darling TA, Nord JL, Schmidt KK, Otto CM. A Randomized Cross-Over Field Study of Pre-Hydration Strategies in Dogs Tracking in Hot Environments. Front Vet Sci 2020; 7:292. [PMID: 32582777 PMCID: PMC7283960 DOI: 10.3389/fvets.2020.00292] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 04/29/2020] [Indexed: 11/13/2022] Open
Abstract
The objective of this study was to evaluate 4 pre-exercise hydration strategies (oral water, chicken-flavored water, chicken-flavored oral electrolyte solution, and subcutaneous electrolyte solution) in working dogs conducting rigorous tracking operations in hot and arid conditions. In a randomized cross-over field study, 7 Border Patrol Search, Trauma, and Rescue (BORSTAR) Unit dogs working/training out of Fort Bliss in El Paso, Texas were randomly assigned to one of 4 different hydration strategy treatments each day for 4 days of study participation. Dogs were provided hydration treatment prior to running 2 separate one-mile tracks and were offered water while tracking. Body weight, blood, and urine were collected at the beginning of the study day and at the completion of each track. Core body temperatures were recorded using internal temperature sensing capsules. The impact of hydration strategy on change in weight, peak temperature, and serum chemical, hematological, and urinary parameters were analyzed using the COIN procedure in Ra. Compared to the other 3 hydration strategies, dogs receiving chicken-flavored water had higher blood creatine kinase values at the end of the second track (p = 0.0361). Otherwise, hydration strategy had minimal effects on blood or urine parameters. Total fluid intake was lower with water only compared to the other three hydration strategies. Dogs developed elevated core body temperatures (median 41°C; 106°F) without signs of heat exhaustion or heat stroke. Alternate hydration strategies increased total fluid intake compared to water alone; however, chicken-flavored water resulted in increased markers of muscle injury suggesting electrolyte-enriched strategies may have an advantage as a hydration strategy. Additionally, electrolyte-enriched fluids before exercise may help these dogs maintain lower peak temperatures.
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Affiliation(s)
- Greta M Niedermeyer
- Department of Clinical Sciences and Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, United States.,Penn Vet Working Dog Center, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Elizabeth Hare
- Penn Vet Working Dog Center, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, United States.,Dog Genetics, LLC, Astoria, NY, United States
| | - Leslie K Brunker
- Penn Vet Working Dog Center, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Richard A Berk
- Department of Criminology and Statistics, University of Pennsylvania, Philadelphia, PA, United States
| | - Kathleen M Kelsey
- Penn Vet Working Dog Center, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Tracy A Darling
- Department of Clinical Sciences and Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, United States.,Penn Vet Working Dog Center, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Jess L Nord
- Department of Clinical Sciences and Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, United States.,Penn Vet Working Dog Center, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Kasey K Schmidt
- College of Veterinary Medicine, Washington State University, Pullman, WA, United States
| | - Cynthia M Otto
- Department of Clinical Sciences and Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, United States.,Penn Vet Working Dog Center, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, United States
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6
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Queau Y, Bijsmans ES, Feugier A, Biourge VC. Increasing dietary sodium chloride promotes urine dilution and decreases struvite and calcium oxalate relative supersaturation in healthy dogs and cats. J Anim Physiol Anim Nutr (Berl) 2020; 104:1524-1530. [PMID: 32157751 PMCID: PMC7540452 DOI: 10.1111/jpn.13329] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 12/20/2019] [Accepted: 01/29/2020] [Indexed: 11/25/2022]
Abstract
Urolithiasis is highly prevalent in dogs and cats, with struvite and calcium oxalate being most commonly diagnosed. Some commercial diets aimed at reducing the risk of urolithiasis are based on inclusion of sodium chloride (NaCl) in an attempt to dilute the urine and the risk of crystallization, but more information on the effect of differing levels of sodium inclusion is needed. The objective of this study was to compare the short‐term effect of four diets differing only in NaCl content (base diet with 0.3% sodium and diets with added NaCl to achieve 0.7, 1.0 and 1.3% sodium as fed) on urinary ion concentrations and relative supersaturation (RSS) of struvite and calcium oxalate in dogs and cats. In both species, there was a significant increase in water intake and urine volume as dietary NaCl increased. Urine sodium concentration increased with increasing dietary NaCl. The highest sodium diet increased urinary calcium excretion in dogs only, while decreasing urinary calcium concentration. Calcium oxalate RSS and struvite RSS both significantly decreased, with the lowest RSS values reported on the highest sodium diet in both dogs and cats (p < .001). These results suggest that an increase in dietary NaCl decreases RSS values in both dogs and cats. Despite an increase in urinary calcium excretion in dogs, urinary calcium concentration and calcium oxalate RSS were lower on high sodium diets due to urine dilution. Long‐term studies are needed to confirm the relationship between RSS and stone occurrence and recurrence.
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Affiliation(s)
- Yann Queau
- Royal Canin Research & Development Centre, Aimargues, France
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7
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Evaluation of a dry therapeutic urinary diet and concurrent administration of antimicrobials for struvite cystolith dissolution in dogs. BMC Vet Res 2019; 15:273. [PMID: 31370897 PMCID: PMC6676539 DOI: 10.1186/s12917-019-1992-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 07/04/2019] [Indexed: 11/29/2022] Open
Abstract
Background Struvite urolithiasis with bacterial urinary tract infection (UTI) is commonly reported in dogs; few data exist to describe successful dissolution protocols in dogs with naturally occurring disease. We hypothesized that a dry therapeutic urinary diet combined with targeted antimicrobial therapy can effectively dissolve presumptive struvite cystolithiasis in dogs with naturally occurring urease-producing bacterial UTI. Results Ten dogs with presumed infection-induced struvite cystolithiasis based on lower urinary tract signs (LUTS), radiodense cystoliths, and urease-producing bacterial UTI were enrolled. At enrollment, antimicrobials and dry therapeutic urinary diet were dispensed. In addition to lack of radiographic resolution of urolithiasis, dogs with persistent clinical signs were considered non-responders. There was no significant difference in pH between responders and non-responders; USG was significantly higher in the responder group. Recheck visits continued until radiographic dissolution or failure was documented. Five of the 10 dogs achieved radiographic dissolution of cystolithiasis within a median of 31 days (range 19–103). In the other 5 dogs, surgical urolith removal was necessary due to persistent LUTS (3 dogs within 2 weeks) or lack of continued dissolution noted radiographically (1 dog with numerous cystoliths failed at day 91; 1 dog failed by day 57 with questionable owner compliance). Conclusions Dissolution of urinary tract infection induced struvite cystoliths can be accomplished in some dogs fed this dry therapeutic urinary diet in conjunction with antimicrobial therapy. Case selection could increase the likelihood of successful dissolution; however, if calcium phosphate is present, this could also prevent stone dissolution. If clinical signs persist despite diet and antimicrobials, stone removal is advised. Electronic supplementary material The online version of this article (10.1186/s12917-019-1992-8) contains supplementary material, which is available to authorized users.
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8
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Robbins MT, Cline MG, Bartges JW, Felty E, Saker KE, Bastian R, Witzel AL. Quantified water intake in laboratory cats from still, free-falling and circulating water bowls, and its effects on selected urinary parameters. J Feline Med Surg 2019; 21:682-690. [PMID: 30303439 PMCID: PMC10814304 DOI: 10.1177/1098612x18803753] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
OBJECTIVES The study objectives were to determine if the method of water presentation (still [S], circulating [C] or free-falling [FF] bowl systems) influences daily water consumption in cats in a controlled environment, and whether differences in water intake affect urine relative super saturation (RSS) for calcium oxalate and struvite, urine specific gravity (USG), urine osmolality (Uosmol) and urine volume. METHODS Sixteen healthy laboratory cats fed a dry diet were individually housed with urine collection systems. Each cat underwent a randomized 2 week crossover period with all bowl systems, allowing a 1 week acclimation period between each crossover. Water intake was measured daily by bowl weight, accounting for spillage and evaporation. USG and urine volume were measured daily, whereas other urinary parameters were measured at various time points throughout each 14 day crossover period. RESULTS Fourteen cats completed the study. Average daily water intake (ml/kg/day), urine volume, USG and urine RSS for struvite and calcium oxalate were not significantly different between water bowls. Uosmol was significantly higher in C compared with S and FF bowl systems (P = 0.009 for both). Three individual cats demonstrated a significant water bowl preference (Cat 4: C >S, P = 0.039; Cat 10: FF >C, P = 0.005; Cat 11: S >C, P = 0.037). CONCLUSIONS AND RELEVANCE Overall, water bowl type had no appreciable effect on water intake. Uosmol was the only urinary parameter found to be significantly different, and was higher for the C bowl. The implication of this is unknown, considering water intake did not differ significantly between bowls. Alternative methods to increase water intake should be implemented beyond providing unique water bowls in patients where augmented water intake would be beneficial for disease management.
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Affiliation(s)
- Michael T Robbins
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, TN, USA
| | - Martha G Cline
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, TN, USA
| | - Joseph W Bartges
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, TN, USA
| | - Erin Felty
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, TN, USA
| | - Korinn E Saker
- Department of Molecular and Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA
| | - Richard Bastian
- Department of Mathematics, Monmouth University, West Long Branch, NJ, USA
| | - Angela L Witzel
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, TN, USA
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Speight N, Colella D, Boardman W, Taggart DA, Haynes JI, Breed WG. Seasonal variation in occurrence of oxalate nephrosis in South Australian koalas (Phascolarctos cinereus). AUSTRALIAN MAMMALOGY 2019. [DOI: 10.1071/am17038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Many koalas (Phascolarctos cinereus) in the Mount Lofty Ranges, South Australia, are affected by oxalate nephrosis, in which renal calcium oxalate deposition occurs. In other species, suboptimal water intake increases the risk of urinary calcium oxalate crystal formation. Koalas principally rely on eucalypt leaf moisture content to maintain hydration but the Mount Lofty Ranges region has hot, dry summers. This study investigates the association between temperature, rainfall and eucalypt leaf moisture and the occurrence of oxalate nephrosis in this population of koalas. Koalas from the Mount Lofty Ranges population that had died or were euthanased between 2008 and 2016 were necropsied and oxalate nephrosis was determined by histopathology (n=50). Leaf moisture content of Mount Lofty eucalypts was determined seasonally. It was found that increased numbers of koalas with oxalate nephrosis died in the months following high mean maximal temperature and in the months following low rainfall. Eucalypt leaf moisture content was not significantly associated with koala deaths. These findings suggest that hot and dry summer/autumn periods contribute to an increased incidence of koala deaths due to oxalate nephrosis. This is probably due to the effects of evaporative water loss and/or lack of access to supplementary drinking water at this time.
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Abstract
Dietary management of urolithiasis in dogs and cats is designed to dissolve calculi when possible and/or reduce the risk of recurrence. The diet must reduce urine relative supersaturation for the particular salt in order to prevent crystallization. To decrease urinary concentrations of crystal precursors, increasing water intake is essential regardless of the stone type. Altering the amounts of dietary precursors of the stone and controlling urine pH is mostly effective for struvite, urate, xanthine, and cystine, but still subject to controversy for calcium oxalate. The investigation of underlying metabolic disorders and close monitoring of animals at risk is recommended.
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Affiliation(s)
- Yann Queau
- Research & Development Center, Royal Canin, 650 avenue de la Petite Camargue, Aimargues 30470, France.
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Pereira AM, Pinto E, Matos E, Castanheira F, Almeida AA, Baptista CS, Segundo MA, Fonseca AJM, Cabrita ARJ. Mineral Composition of Dry Dog Foods: Impact on Nutrition and Potential Toxicity. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:7822-7830. [PMID: 29953228 DOI: 10.1021/acs.jafc.8b02552] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Detailed mineral profile of a selection of commercially available complete dry dog foods was determined using ICP-MS (Se, Cu, Mn, Zn, and nonessential trace elements), flame photometry (Na and K) and atomic and molecular spectrophotometry (Ca, P, Mg, and Fe). The contribution of ingredients to the mineral composition was correlated to the food market segment. Results showed an oversupply of essential elements due to the energy density effect on feed intake. Additives contributed from 40.8 to 55.1% to the total trace elements contents. With the exception of Se, all trace elements were supplied above the nutritional requirements of adult dogs. Legal limits of Cu, Se, and Zn were surpassed. The content of nonessential trace elements included values in the range of nanograms to micrograms per kg, without surpassing safe upper limits. This work brings awareness to the need to find supplementation strategies that ensure nutritional adequacy and avoid waste.
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Affiliation(s)
- Ana Margarida Pereira
- LAQV, REQUIMTE, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) , Universidade do Porto , Rua de Jorge Viterbo Ferreira no. 228 , 4050-313 Porto , Portugal
| | - Edgar Pinto
- LAQV, REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia , Universidade do Porto , Rua Jorge Viterbo Ferreira no. 228 , 4050-313 Porto , Portugal
| | - Elisabete Matos
- SORGAL, Sociedade de Óleos e Rações S.A. , Estrada Nacional 109 Lugar da Pardala , 3880-728 S. João Ovar , Portugal
| | - Francisco Castanheira
- Alltechaditivos - Alimentação Animal Lda. , Parque de Monserrate - Av. Dr. Luis Sá n° 9 - Arm. A , 2710-089 Abrunheira , Portugal
| | - Agostinho A Almeida
- LAQV, REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia , Universidade do Porto , Rua Jorge Viterbo Ferreira no. 228 , 4050-313 Porto , Portugal
| | - Cláudia S Baptista
- CECA-ICETA, Departamento de Clínicas Veterinárias, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) , Universidade do Porto , Rua Jorge Viterbo Ferreira no. 228 , 4050-313 Porto , Portugal
| | - Marcela A Segundo
- LAQV, REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia , Universidade do Porto , Rua Jorge Viterbo Ferreira no. 228 , 4050-313 Porto , Portugal
| | - António J M Fonseca
- LAQV, REQUIMTE, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) , Universidade do Porto , Rua de Jorge Viterbo Ferreira no. 228 , 4050-313 Porto , Portugal
| | - Ana R J Cabrita
- LAQV, REQUIMTE, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) , Universidade do Porto , Rua de Jorge Viterbo Ferreira no. 228 , 4050-313 Porto , Portugal
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Thornton LA, Burchell RK, Burton SE, Lopez-Villalobos N, Pereira D, MacEwan I, Fang C, Hatmodjo AC, Nelson MA, Grinberg A, Velathanthiri N, Gal A. The Effect of Urine Concentration and pH on the Growth of Escherichia Coli in Canine Urine In Vitro. J Vet Intern Med 2018; 32:752-756. [PMID: 29469957 PMCID: PMC5866962 DOI: 10.1111/jvim.15045] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 11/11/2017] [Accepted: 12/19/2017] [Indexed: 11/28/2022] Open
Abstract
Background Lower urinary tract infections are common in dogs, and Escherichia coli is the most common bacterial pathogen isolated. The literature has conflicting evidence regarding the inhibitory effects of urine concentration and pH on E. coli growth. Hypothesis/Objectives To determine the effect of different pH and urine concentrations on E. coli growth in vitro. Animals Voided urine samples from 10 apparently healthy spayed female dogs were used. Methods A matrix of 9 urine specific gravity (USG; 1.010, 1.020, and 1.030) and pH (5.5, 7.0, and 8.5) combinations was prepared by diluting and titrating filtered voided urine samples. Three E. coli isolates were obtained from urine of female dogs with signs of lower urinary tract infection and cultured at different urine pH and USG combinations in wells of a microtiter plate. The number of E. coli colony‐forming units (CFU) per mL of urine was calculated after aerobic incubation of the urine at 37°C for 18 hours, and statistically compared. Results Significant differences were identified in the mean log CFU/mL among different combinations of pH and USG. The lowest log CFU/mL were observed in alkaline concentrated urine (pH 8.5 and USG 1.030). Conclusions and Clinical Importance Escherichia coli in vitro growth was higher in neutral to acidic and diluted urine compared to alkaline and concentrated urine. The impact of non‐alkalizing diluting diets on the incidence of E. coli lower urinary tract infections should be further explored.
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Affiliation(s)
- L A Thornton
- School of Veterinary Sciences, Massey University, Palmerston North, Manawatu-Wanganui, New Zealand
| | - R K Burchell
- School of Veterinary Sciences, Massey University, Palmerston North, Manawatu-Wanganui, New Zealand
| | - S E Burton
- School of Veterinary Sciences, Massey University, Palmerston North, Manawatu-Wanganui, New Zealand
| | - N Lopez-Villalobos
- School of Veterinary Sciences, Massey University, Palmerston North, Manawatu-Wanganui, New Zealand
| | - D Pereira
- School of Veterinary Sciences, Massey University, Palmerston North, Manawatu-Wanganui, New Zealand
| | - I MacEwan
- School of Veterinary Sciences, Massey University, Palmerston North, Manawatu-Wanganui, New Zealand
| | - C Fang
- School of Veterinary Sciences, Massey University, Palmerston North, Manawatu-Wanganui, New Zealand
| | - A C Hatmodjo
- School of Veterinary Sciences, Massey University, Palmerston North, Manawatu-Wanganui, New Zealand
| | - M A Nelson
- School of Veterinary Sciences, Massey University, Palmerston North, Manawatu-Wanganui, New Zealand
| | - A Grinberg
- School of Veterinary Sciences, Massey University, Palmerston North, Manawatu-Wanganui, New Zealand
| | - N Velathanthiri
- School of Veterinary Sciences, Massey University, Palmerston North, Manawatu-Wanganui, New Zealand
| | - A Gal
- School of Veterinary Sciences, Massey University, Palmerston North, Manawatu-Wanganui, New Zealand
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13
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The effect of reducing energy density, via the addition of water to dry diet, on body weight and activity in dogs. J Nutr Sci 2017; 6:e42. [PMID: 29152246 PMCID: PMC5672310 DOI: 10.1017/jns.2017.43] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 06/28/2017] [Accepted: 06/29/2017] [Indexed: 12/23/2022] Open
Abstract
Approximately 40 % of pet dogs are estimated to be overweight and this is associated with health conditions significantly reducing life span and quality. In cats, dietary energy dilution has been reported to increase activity levels and aid healthy body-weight maintenance. Our aim was to investigate this in dogs. For 28 d, a complete and balanced standard dry diet, hydrated to a total moisture content (TMC) of 72 %, was offered to forty-six dogs at individual maintenance energy requirements (MER). Intake, body weight and activity were measured. For the following 28 d, the dry diet was offered at 200 % of MER with or without hydration (7·6 or 72 % TMC) and measurements repeated. When offered diets in excess, body weight increased significantly faster (19·3 g/d) with the hydrated diet (P = 0·001), but activity levels did not change from baseline (P = 0·392), while activity reduced significantly with the dry diet (about 15 %; P < 0·001). Dogs completely compensated for the reduction of dietary energy content, indicating that this is not a useful strategy for maintaining body weight when offered excess food.
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Bartges JW. Feline Calcium Oxalate Urolithiasis: Risk factors and rational treatment approaches. J Feline Med Surg 2017; 18:712-22. [PMID: 27562981 DOI: 10.1177/1098612x16660442] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
PRACTICAL RELEVANCE Uroliths occur commonly in the bladder and/or urethra of cats and can be lifethreatening if urethral obstruction occurs. Calcium oxalate accounts for 40-50% of urocystoliths and these stones are not amenable to medical dissolution; therefore, removal by surgery or minimally invasive techniques is required if uroliths must be treated. Medical protocols for prevention involve decreasing urine saturation for minerals that form uroliths. ETIOPATHOGENESIS Formation of uroliths is not a disease, but rather a complication of several disorders. Some disorders can be identified and corrected (such as infection-induced struvite urolith formation); others can be identified but not corrected (such as idiopathic hypercalcemia). In most cats with calcium oxalate urolith formation the underlying etiopathogenesis is not known. A common denominator of all these disorders is that they can from time to time create oversaturation of urine with one or more crystal precursors, resulting in formation of crystals. BASIC CONCEPTS In order to develop rational and effective approaches to treatment, abnormalities that promote urolith formation must be identified, with the goal of eliminating or modifying them. It is important, therefore, to understand several basic concepts associated with urolithiasis and the factors that promote urolith formation that may be modified with medical treatment; for example, the state of urinary saturation, modifiers of crystal formation, potential for multiple crystal types, and presence of bacterial infection or urinary obstruction.
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Affiliation(s)
- Joseph W Bartges
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, The University of Georgia, 501 D. W. Brooks Drive, Athens, GA 30602, USA
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15
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O'Kell AL, Grant DC, Khan SR. Pathogenesis of calcium oxalate urinary stone disease: species comparison of humans, dogs, and cats. Urolithiasis 2017; 45:329-336. [PMID: 28361470 DOI: 10.1007/s00240-017-0978-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 03/23/2017] [Indexed: 01/09/2023]
Abstract
Idiopathic calcium oxalate nephrolithiasis is a highly recurrent disease that is increasing in prevalence. Decades of research have not identified effective methods to consistently prevent the formation of nephroliths or induce medical dissolution. Idiopathic calcium oxalate nephroliths form in association with renal papillary subepithelial calcium phosphate deposits called Randall's plaques (RPs). Rodent models are commonly used to experimentally induce calcium oxalate crystal and stone formation, but a rodent model that conclusively forms RPs has not been identified. Both dogs and cats form calcium oxalate uroliths that can be recurrent, but the etiopathologic mechanisms of stone formation, especially renal pathologic findings, are a relatively unexploited area of study. A large animal model that shares a similar environment to humans, along with a shorter lifespan and thus shorter time to recurrence, might provide an excellent means to study preventative and therapeutic measures, along with enhancing the concepts of the one health initiative. This review article summarizes and compares important known features of idiopathic calcium oxalate stone disease in humans, dogs, and cats, and emphasizes important knowledge gaps and areas for future study in the quest to discover a naturally occurring animal model of idiopathic calcium oxalate stone disease.
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Affiliation(s)
- Allison L O'Kell
- Department of Small Animal Clinical Sciences, The University of Florida, 2015 SW 16th Ave, PO Box 100126, Gainesville, FL, 32610, USA
- Department of Urology, The University of Florida, 1600 SW Archer Road, Gainesville, FL, 32610, USA
| | - David C Grant
- Department of Small Animal Clinical Sciences, Virginia Tech, 215 Duck Pond Drive, Blacksburg, VA, 24061, USA
| | - Saeed R Khan
- Department of Urology, The University of Florida, 1600 SW Archer Road, Gainesville, FL, 32610, USA.
- Department of Pathology, Immunology, and Laboratory Medicine, The University of Florida, 1600 SW Archer Road, Gainesville, FL, 32610, USA.
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16
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Bartges J, Kirk C. Nutrition and Urinary Tract Disease—Myths and Legends. J Feline Med Surg 2016. [DOI: 10.1016/s1098-612x-07-00199-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Lulich JP, Berent AC, Adams LG, Westropp JL, Bartges JW, Osborne CA. ACVIM Small Animal Consensus Recommendations on the Treatment and Prevention of Uroliths in Dogs and Cats. J Vet Intern Med 2016; 30:1564-1574. [PMID: 27611724 PMCID: PMC5032870 DOI: 10.1111/jvim.14559] [Citation(s) in RCA: 89] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 07/08/2016] [Accepted: 07/11/2016] [Indexed: 11/28/2022] Open
Abstract
In an age of advancing endoscopic and lithotripsy technologies, the management of urolithiasis poses a unique opportunity to advance compassionate veterinary care, not only for patients with urolithiasis but for those with other urinary diseases as well. The following are consensus-derived, research and experience-supported, patient-centered recommendations for the treatment and prevention of uroliths in dogs and cats utilizing contemporary strategies. Ultimately, we hope that these recommendations will serve as a foundation for ongoing and future clinical research and inspiration for innovative problem solving.
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Affiliation(s)
- J P Lulich
- Department of Veterinary Clinical Sciences, University of Minnesota, Saint Paul, MN.
| | | | - L G Adams
- Department of Veterinary Clinical Sciences, Purdue University, West Lafayette, IN
| | - J L Westropp
- Department of Veterinary Medicine and Epidemiology, University of California, Davis, CA
| | - J W Bartges
- Department of Small Animal Medicine and Surgery, University of Georgia, Athens, GA
| | - C A Osborne
- Department of Veterinary Clinical Sciences, University of Minnesota, Saint Paul, MN
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18
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Rückert C, Siener R, Ganter M, Coenen M, Vervuert I. [Effects of a supplementation on sodium chloride or ammonium chloride on urolithic potential in the rabbit]. TIERARZTLICHE PRAXIS. AUSGABE K, KLEINTIERE/HEIMTIERE 2016; 44:252-259. [PMID: 27299360 DOI: 10.15654/tpk-151071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Accepted: 02/28/2016] [Indexed: 06/06/2023]
Abstract
AIM Reduction of urolithic potential by means of increased water intake and urine dilution through supplementation of sodium chloride (NaCl) or decrease of urine pH by supplementation of ammonium chloride (NH4Cl) in rabbits. MATERIALS AND METHODS Sixteen female, 6-month-old dwarf rabbits received the following three feeding regimens in a random order: complete feed without supplements = control; complete feed + 10 g NaCl/kg feed = NaCl; complete feed + 2.5 g NH4Cl/kg feed = NH4Cl. The diets were fed ad libitum over a period of 27 days without roughage. Water was provided ad libitum by a drinker. A 14-day wash-out-period (hay feeding) was performed between the different diets. Blood, faeces, and urine were collected at the beginning of each feeding period, after 21-day adaptation to the respective diet, and after the 3-day collection period. The following parameters were analysed: water and food intake as well as acid-base balance and mineral content in blood, urine, and faeces. RESULTS NaCl supplementation numerically increased the daily water intake from 40.5 ± 14.4 ml/kg body weight (BW) (control) up to 49.5 ± 14.3 ml/kg BW and significantly increased the daily urine volume from 16.9 ± 7.8 ml/kg BW (control group) to 21.1 ± 7.4 ml/kg BW. The specific gravity of urine samples from NaCl supplementation decreased from 1.060 ± 0.008 to 1.044 ± 0.008. NH4Cl supplementation did not induce significant changes in urine pH, blood acid-base parameters, or calcium retention. Relative supersaturations (RSS) for calcium oxalate and calcium phosphate showed no significant changes after treatment. RSS for struvite increased from 360 ± 735 (after hay feeding) to 3312 ± 6188 on control feeding, 2910 ± 4913 with NaCl supplementation, and 3022 ± 6635 with NH4Cl supplementation (p < 0.05). CONCLUSIONS NaCl supplementation significantly increased the urine volume and decreased its specific gravity. Therefore, NaCl supplementation might be an additional dietary treatment to increase the elimination of urine crystals in rabbits. NH4Cl supplementation did not induce acidification of the urine.
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Affiliation(s)
| | | | | | | | - Ingrid Vervuert
- PD Dr. med. vet. Ingrid Vervuert, Institut für Tierernährung, Ernährungsschäden und Diätetik der Universität Leipzig, An den Tierklinken 9, 04103 Leipzig, E-Mail:
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Okafor CC, Lefebvre SL, Pearl DL, Yang M, Wang M, Blois SL, Lund EM, Dewey CE. Risk factors associated with calcium oxalate urolithiasis in dogs evaluated at general care veterinary hospitals in the United States. Prev Vet Med 2014; 115:217-28. [DOI: 10.1016/j.prevetmed.2014.04.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Revised: 03/23/2014] [Accepted: 04/14/2014] [Indexed: 10/25/2022]
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Lulich JP, Osborne CA, Albasan H, Koehler LA, Ulrich LM, Lekcharoensuk C. Recent shifts in the global proportions of canine uroliths. Vet Rec 2013; 172:363. [PMID: 23396526 DOI: 10.1136/vr.101056] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Epidemiological surveys are important tools to identify emerging trends in disease. The Minnesota Urolith Centre has been tracking the occurrence of uroliths for over 30 years. To evaluate global changes in the frequencies of canine uroliths, submissions to the Minnesota Urolith Centre in 1999 and 2000 (n = 39,965) were compared with submissions in 2009 and 2010 (n = 99,598). The proportion of calcium oxalate uroliths rose on every continent except in Europe. Seventy-five per cent of dogs with calcium oxalate uroliths were between 5 and 11 years old. The proportion of struvite uroliths decreased on every continent except in Australia-Oceania. Seventy-seven per cent of all struvite formers were between two and eight years old. The proportion of purine uroliths has declined slightly. Worldwide, uroliths composed of cystine, calcium phosphate, calcium phosphate carbonate and silica remain uncommon. Epidemiological studies of urolithiasis are essential for constructing effective experimental designs and selecting appropriate cases and controls to conduct clinical trials with meaningful results.
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Affiliation(s)
- J P Lulich
- Department of Veterinary Clinical Sciences, Minnesota Urolith Centre, College of Veterinary Medicine, University of Minnesota, 1352 Boyd Avenue, St Paul, MN 55105, USA.
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Dijcker JC, Hagen-Plantinga EA, Everts H, Bosch G, Kema IP, Hendriks WH. Dietary and animal-related factors associated with the rate of urinary oxalate and calcium excretion in dogs and cats. Vet Rec 2012; 171:46. [PMID: 22735988 DOI: 10.1136/vr.100293] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
This paper reports the results of a cohort study and randomised clinical trial (RCT) in cross-over design. In the cohort study, the range of urinary oxalate (Uox) and calcium (Uca) excretion was determined within a sample of the Dutch population of dogs and cats, and dietary and animal-related factors associated with these urine parameters were identified. Spot urine samples were collected from privately owned dogs (n=141) and cats (n=50). The RCT determined the effect of a commercial raw meat diet versus a dry diet on Uox and Uca excretion rate in 23 dogs. In the cohort study, Uox excretion ranged from 21.1 to 170.6 mmol oxalate/mol creatinine in dogs and 27.5 to 161.6 in cats. Urinary calcium excretion ranged from 3.4 to 462.8 mmol calcium/mol creatinine in dogs and 10.1 to 128.0 in cats. In dogs, increased Uox and Uca excretion was associated with (1) the intake of a dry diet as the primary source of energy, (2) receiving no snacks and (3) breed. Increased Uox excretion was associated with males as well. In cats, urine collection in anaesthetised subjects was identified as a confounder. In the RCT, feeding the dry diet resulted in higher Uox (P<0.001) and Uca (P=0.021) excretion rates in dogs.
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Affiliation(s)
- J C Dijcker
- Division of Nutrition, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 7, 3584 CL Utrecht, The Netherlands
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23
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The impact of home-prepared diets and home oral hygiene on oral health in cats and dogs. Br J Nutr 2011; 106 Suppl 1:S124-7. [DOI: 10.1017/s0007114511000821] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Many factors influence the oral health status of cats and dogs. The present study aimed to elucidate the influence of feeding home-prepared (HP) foodv.commercial pet food on oral health parameters in these animals and to investigate the effect of home oral hygiene on oral health. The study surveyed 17 184 dogs and 6371 cats visiting over 700 Polish veterinary surgeries in 2006–7 during a Pet Smile activity organised by the Polish Small Animal Veterinary Association. All animals underwent conscious examinations to assess dental deposits, size of mandibular lymph nodes and gingival health. An oral health index (OHI) ranging from 0 to 8 was calculated for each animal by combining examination scores, where 0 indicates good oral health and 8 indicates poorest oral health. Information was collected on age, diet and home oral hygiene regimens. There was a significant effect of diet on the OHI (P < 0·001) whereby feeding the HP diet increased the probability of an oral health problem in both cats and dogs. There was a significant beneficial effect of feeding only commercial pet food compared with the HP diet when at least part of the diet was composed of dry pet food. Daily tooth brushing or the offering of daily dental treats were both effective in significantly reducing the OHI in both cats and dogs compared with those receiving sporadic or no home oral hygiene. Feeding only a dry diet was beneficial for oral health in cats and dogs. Tooth brushing and the offering of dental treats were very effective in maintaining oral health, provided they were practised daily.
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Abstract
Practical relevance Calcium oxalate (CaOx) containing stones are among the most common of the urinary tract stones identified in cats. Risk factors Risk factors for CaOx stone formation include such things as breed, gender and diet; stress and obesity have also been hypothesized to be risk factors for this disease. Management approach A tailored, individual management strategy for preventing CaOx stone recurrence is important and should include addressing the diet, environment and any other comorbid conditions present. Increasing the cat's moisture intake is one of the key mechanisms for preventing recurrence. Clinical challenges CaOx ureterolithiasis has emerged as a difficult and sometimes life-threatening problem for cats. In those cats where stones are found incidentally, periodic monitoring may be required to assess for disease progression. Interventional procedures such as ureteral stent placements are now increasingly being performed for recurrent cases or those with larger stone burdens. Periodic radiographs for more severe cases and frequent client communication can help ensure successful outcomes for cats with lower and upper CaOx stone disease. Evidence base Limited evidence-based studies are published regarding management of feline upper and lower urinary tract CaOx stone disease, making this a difficult condition to manage in some cats. Studies designed to evaluate the relationship to dietary modifications, medical management, stress, obesity and surgical techniques are warranted in cats with upper and lower urinary tract CaOx stones.
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Influence of nutrition on feline calcium oxalate urolithiasis with emphasis on endogenous oxalate synthesis. Nutr Res Rev 2011; 24:96-110. [PMID: 21338551 DOI: 10.1017/s0954422410000351] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The prevalence of calcium oxalate (CaOx) uroliths detected in cats with lower urinary tract disease has shown a sharp increase over the last decades with a concomitant reciprocal decrease in the occurrence of struvite (magnesium ammonium phosphate) uroliths. CaOx stone-preventative diets are available nowadays, but seem to be marginally effective, as CaOx urolith recurrence occurs in patients fed these diets. In order to improve the preventative measures against CaOx urolithiasis, it is important to understand its aetiopathogenesis. The main research focus in CaOx formation in cats has been on the role of Ca, whereas little research effort has been directed towards the role and origin of urinary oxalates. As in man, the exogenous origin of urinary oxalates in cats is thought to be of minor importance, although the precise contribution of dietary oxalates remains unclear. The generally accepted dietary risk factors for CaOx urolithiasis in cats are discussed and a model for the biosynthetic pathways of oxalate in feline liver is provided. Alanine:glyoxylate aminotransferase 1 (AGT1) in endogenous oxalate metabolism is a liver-specific enzyme targeted in the mitochondria in cats, and allows for efficient conversion of glyoxylate to glycine when fed a carnivorous diet. The low peroxisomal activity of AGT1 in cat liver is compatible with the view that felids utilised a low-carbohydrate diet throughout evolution. Future research should focus on understanding de novo biosynthesis of oxalate in cats and their adaptation(s) in oxalate metabolism, and on dietary oxalate intake and absorption by cats.
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Tschudin A, Clauss M, Codron D, Liesegang A, Hatt JM. Water intake in domestic rabbits (Oryctolagus cuniculus) from open dishes and nipple drinkers under different water and feeding regimes. J Anim Physiol Anim Nutr (Berl) 2010; 95:499-511. [DOI: 10.1111/j.1439-0396.2010.01077.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Wisener LV, Pearl DL, Houston DM, Reid-Smith RJ, Moore AE. Risk factors for the incidence of calcium oxalate uroliths or magnesium ammonium phosphate uroliths for dogs in Ontario, Canada, from 1998 to 2006. Am J Vet Res 2010; 71:1045-54. [DOI: 10.2460/ajvr.71.9.1045] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Metabolite fingerprinting of urine suggests breed-specific dietary metabolism differences in domestic dogs. Br J Nutr 2009; 103:1127-38. [PMID: 20003623 DOI: 10.1017/s000711450999300x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Selective breeding of dogs has culminated in a large number of modern breeds distinctive in terms of size, shape and behaviour. Inadvertently, a range of breed-specific genetic disorders have become fixed in some pure-bred populations. Several inherited conditions confer chronic metabolic defects that are influenced strongly by diet, but it is likely that many less obvious breed-specific differences in physiology exist. Using Labrador retrievers and miniature Schnauzers maintained in a simulated domestic setting on a controlled diet, an experimental design was validated in relation to husbandry, sampling and sample processing for metabolomics. Metabolite fingerprints were generated from 'spot' urine samples using flow injection electrospray MS (FIE-MS). With class based on breed, urine chemical fingerprints were modelled using Random Forest (a supervised data classification technique), and metabolite features (m/z) explanatory of breed-specific differences were putatively annotated using the ARMeC database (http://www.armec.org). GC-MS profiling to confirm FIE-MS predictions indicated major breed-specific differences centred on the metabolism of diet-related polyphenols. Metabolism of further diet components, including potentially prebiotic oligosaccharides, animal-derived fats and glycerol, appeared significantly different between the two breeds. Analysis of the urinary metabolome of young male dogs representative of a wider range of breeds from animals maintained under domestic conditions on unknown diets provided preliminary evidence that many breeds may indeed have distinctive metabolic differences, with significant differences particularly apparent in comparisons between large and smaller breeds.
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Xu H, Laflamme DP, Long GL. Effects of dietary sodium chloride on health parameters in mature cats. J Feline Med Surg 2009; 11:435-41. [DOI: 10.1016/j.jfms.2008.10.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/01/2008] [Indexed: 11/24/2022]
Abstract
High sodium diets have been shown to enhance water intake and urine output, a potential benefit in the management of lower urinary tract diseases. However, one study suggested that high salt (sodium chloride) diets might have adverse effects on the kidneys [Kirk CA, Jewell DE, Lowry SR. Effects of sodium chloride on selected parameters in cats. Vet Ther 2006; 7: 333–46]. Therefore, the objective of this controlled, prospective study was to evaluate the effects of diets with different salt content (1.11% sodium and 1.78% chloride versus 0.55% sodium and 1.02% chloride, dry matter (dm)) when fed to mature cats (mean age 7.0 years; 12 cats per group) over a 6-month period. Food intake, body weight, bone mineral content, total body hydration status, blood pressure, and markers of renal function were unaffected by salt intake, and no adverse effects were observed. When a subset of cats ( n=9) with an initial serum creatinine ≥1.6 mg/dl was evaluated separately, there remained no evidence of adverse effects associated with increased salt intake. These results are consistent with the majority of other studies evaluating sodium intake in cats, as well as with the National Research Council's assessment, all of which indicate that sodium at 1.5% of the diet dm is not harmful to healthy cats.
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Affiliation(s)
- Hui Xu
- Nestle Purina Pet Care Company, Checkerboard Square, St Louis, MO 63164, USA
| | | | - Grace L. Long
- Nestle Purina Pet Care Company, Checkerboard Square, St Louis, MO 63164, USA
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Fukunaga K, Saito M, Muto M, Mishima K, Fujiwara M, Orito K. Effects of urine pH modification on pharmacokinetics of phenobarbital in healthy dogs. J Vet Pharmacol Ther 2009; 31:431-6. [PMID: 19000262 DOI: 10.1111/j.1365-2885.2008.00977.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Although pH modification is one of the effective strategies for dissolving or preventing uroliths, little is known about its effects on the pharmacokinetics of phenobarbital in dogs. Five spayed, female Beagles were fed with a twice-daily diet that included potassium citrate and ammonium chloride for urine alkalinization and acidification, respectively. After a stabilizing period of 7 days, a single clinical dose of phenobarbital (3 mg/kg) was orally administered, and time-course changes in its serum and urine concentrations were determined by high-performance liquid chromatography. Total amounts of unchanged phenobarbital excreted into urine for 216 h were decreased by urine acidification and increased by urine alkalinization. The elimination half-life of serum phenobarbital in dogs with urine alkalinization was shortened and Cl(R) increased when compared with dogs with urine acidification. Other pharmacokinetic parameters, including C(max), T(max), AUC(0-216), Cl/F, and A(e0-216) were not changed by modification of the urine pH. These results suggest that the pH of urine is likely to be a determinant of the pharmacokinetics, especially urine excretion rate, of a clinical dose of oral phenobarbital. It is possible that the serum concentration of phenobarbital might be altered when a pH modifying-diet is administered for the purpose of dissolving or preventing uroliths.
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Affiliation(s)
- K Fukunaga
- Department of Pharmacology, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
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Bartges J, Kirk C. Nutrition and Urolithiasis. J Feline Med Surg 2007. [DOI: 10.1016/s1098-612x-07-00170-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Lulich JP, Osborne CA, Sanderson SL. Effects of dietary supplementation with sodium chloride on urinary relative supersaturation with calcium oxalate in healthy dogs. Am J Vet Res 2005; 66:319-24. [PMID: 15757134 DOI: 10.2460/ajvr.2005.66.319] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate the effect of dietary supplementation with sodium chloride (NaCl) on urinary calcium excretion, urine calcium concentration, and urinary relative supersaturation (RSS) with calcium oxalate (CaOx). ANIMALS 6 adult female healthy Beagles. PROCEDURE By use of a crossover study design, a canned diet designed to decrease CaOx urolith recurrence with and without supplemental NaCl (i.e., 1.2% and 0.24% sodium on a dry-matter basis, respectively) was fed to dogs for 6 weeks. Every 14 days, 24-hour urine samples were collected. Concentrations of lithogenic substances and urine pH were used to calculate values of urinary RSS with CaOx. RESULTS When dogs consumed a diet supplemented with NaCl, 24-hour urine volume and 24-hour urine calcium excretion increased. Dietary supplementation with NaCl was not associated with a change in urine calcium concentration. However, urine oxalate acid concentrations and values of urinary RSS with CaOx were significantly lower after feeding the NaCI-supplemented diet for 28 days. CONCLUSIONS AND CLINICAL RELEVANCE Dietary supplementation with NaCl in a urolith-prevention diet decreased the propensity for CaOx crystallization in the urine of healthy adult Beagles. However, until long-term studies evaluating the efficacy and safety of dietary supplementation with NaCl in dogs with CaOx urolithiasis are preformed, we suggest that dietary supplementation with NaCl be used cautiously.
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Affiliation(s)
- Jody P Lulich
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108, USA
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Hawthorne AJ, Markwell PJ. Dietary sodium promotes increased water intake and urine volume in cats. J Nutr 2004; 134:2128S-2129S. [PMID: 15284418 DOI: 10.1093/jn/134.8.2128s] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Amanda J Hawthorne
- WALTHAM Centre for Pet Nutrition, Waltham on the Wolds, Leicestershire, UK.
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Stevenson AE, Hynds WK, Markwell PJ. The relative effects of supplemental dietary calcium and oxalate on urine composition and calcium oxalate relative supersaturation in healthy adult dogs. Res Vet Sci 2003; 75:33-41. [PMID: 12801461 DOI: 10.1016/s0034-5288(03)00042-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The aim of this study was to establish the relative effects of dietary calcium and oxalate (in the form of oxalic acid) on the composition of urine produced by healthy adult Cairn Terriers and Miniature Schnauzers. A nutritionally complete dry dog food was fed to 7 dogs (4 Cairn terriers and 3 Miniature schnauzers) for 24 weeks. The dogs were fed the diet alone, or supplemented with six different combinations of dietary calcium (as carbonate and sulphate) and oxalate (as oxalic acid) commonly found in dry commercially prepared dog foods. Urine pH, volume, specific gravity, and concentrations of 12 analytes were measured for each dog; urinary relative supersaturation (RSS) with calcium oxalate (CaOx) was calculated from these values. The effects of supplemental calcium and oxalate were established using two-way analysis of variance and multiple range tests (least significant difference); P<0.05 was considered significant. The lowest level of dietary calcium and oxalate resulted in the lowest CaOx RSS. The high calcium, low oxalate diet resulted in the highest CaOx RSS, a low calcium diet with increased dietary oxalate also tended to increase CaOx RSS although results were highly variable. Urinary calcium concentration increased significantly with dietary calcium; urinary oxalate increased, although inconsistently, with dietary oxalic acid only when dietary calcium was low. Measures to reduce both calcium and oxalate should be considered when implementing dietary changes to reduce the risk of calcium oxalate formation in dogs. A reduction in dietary calcium without a concomitant decrease in dietary oxalate may increase the risk of CaOx crystallisation in susceptible dogs.
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Affiliation(s)
- A E Stevenson
- The WALTHAM Centre for Pet Nutrition, Waltham on the Wolds, Melton Mowbray, Leicestershire LE14 4RT, UK
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