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van Bömmel-Wegmann S, Zentek J, Gehlen H, Barton AK, Paßlack N. Effects of dietary zinc chloride hydroxide and zinc methionine on the immune system and blood profile of healthy adult horses and ponies. Arch Anim Nutr 2023; 77:17-41. [PMID: 36790082 DOI: 10.1080/1745039x.2023.2168993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
The effects of dietary zinc on the immune function of equines have not been evaluated in detail so far. In the present study, eight healthy adult ponies and two healthy adult horses were fed a diet supplemented with either zinc chloride hydroxide or zinc methionine in six feeding periods of four weeks each (according to maintenance zinc requirement, 120 mg zinc/kg dry matter, and 240 mg zinc/kg dry matter, for both dietary zinc supplements, respectively). All animals received the six diets, with increasing amounts of zinc chloride hydroxide in the feeding periods 1-3, and with increasing amounts of zinc methionine in the feeding periods 4-6. At the end of each feeding period, blood samples were collected for a blood profile and the measurement of selected immune variables. Increasing dietary zinc chloride hydroxide doses increased the glutathione concentrations in the erythrocyte concentrate and the glutathione peroxidase activity in the erythrocyte lysate, decreased the numbers of total leukocytes and granulocytes in the blood, and also decreased the interleukin-2 concentrations in the plasma of the animals. The dietary supplementation of increasing doses of zinc methionine enhanced the mitogen-stimulated proliferative activity of peripheral blood mononuclear cells, and decreased the glutathione concentrations in the erythrocyte concentrate and the glutathione peroxidase activity in the plasma of the animals. The percentage of blood monocytes with oxidative burst after in vitro stimulation with E. coli decreased with increasing dietary zinc concentrations, independently of the zinc compound used. The blood profile demonstrated effects of the zinc supplements on the red blood cells and the bilirubin metabolism of the horses and ponies, which require further investigation. Overall, high doses of dietary zinc modulate the equine immune system, for the most part also depending on the zinc compound used.
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Affiliation(s)
| | - Jürgen Zentek
- Institute of Animal Nutrition, Freie Universität Berlin, Berlin, Germany
| | - Heidrun Gehlen
- Equine Clinic, Freie Universität Berlin, Berlin, Germany
| | | | - Nadine Paßlack
- Institute of Animal Nutrition, Freie Universität Berlin, Berlin, Germany
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Fowler AL, Pyles MB, Hayes SH, Crum AD, Harris PA, Krotky A, Lawrence LM. Effect of weight change on markers of bone turnover and phosphorus excretion. J Equine Vet Sci 2022; 118:104080. [PMID: 35843389 DOI: 10.1016/j.jevs.2022.104080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 07/06/2022] [Accepted: 07/11/2022] [Indexed: 11/25/2022]
Abstract
There is little information about how weight change in horses impacts bone turnover and the metabolism of minerals associated with bone. This study evaluated weight change in mature horses as a factor that could alter bone turnover and fecal P output. Fifteen horses (555±8 kg) were assigned to three treatments: weight loss (LO; n=5), weight maintenance (MA; n=5), and weight gain (GA; n=5). Diets contained 75%, 100%, and 145% of maintenance digestible energy requirements for the three treatments, respectively, but contained similar amounts of protein and minerals. At the end of the weight change period (27±6 d), blood samples were analyzed for bone biomarkers and a 5-day total fecal collection was conducted to measure fecal mineral output. Horses fed the MA diet had an average daily weight change that was not different from either the GA or LO treatments, while weight change was different between the GA group and the LO group (0.49 kg/d vs -1.16 kg/d; P=0.017). Weight change was negatively correlated with cross-linking C-terminal telopeptides of type-I collagen, a biomarker of bone resorption (r=-0.62; P=0.014) and tended to be positively correlated with bone alkaline phosphatase, a biomarker of bone formation (r=0.48; P=0.068). Also, fecal P output tended to be lower in GA than in LO horses (P=0.085), while MA was intermediate and not different, suggesting that weight loss was increasing bone resorption, resulting in a tendency for higher P loss from the body. Weight change in horses can influence bone metabolism as well as mineral excretion.
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Affiliation(s)
- A L Fowler
- Department of Animal and Food Sciences, University of Kentucky, Lexington, KY, USA 40546.
| | - M B Pyles
- Department of Animal and Food Sciences, University of Kentucky, Lexington, KY, USA 40546
| | - S H Hayes
- Department of Animal and Food Sciences, University of Kentucky, Lexington, KY, USA 40546
| | - A D Crum
- Department of Animal and Food Sciences, University of Kentucky, Lexington, KY, USA 40546
| | - P A Harris
- Equine Studies Group, Waltham Petcare Science Institute, Melton, Mowbray, LE14 4RT, UK
| | - A Krotky
- MARS Horsecare US, Inc., Dalton OH, USA 44618
| | - L M Lawrence
- Department of Animal and Food Sciences, University of Kentucky, Lexington, KY, USA 40546
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Pritchard A, Nielsen BD, Robison C, Spooner H. Furosemide administration results in a transient alteration in calcium balance in mature horses. J Anim Physiol Anim Nutr (Berl) 2020; 104:946-953. [PMID: 32187741 DOI: 10.1111/jpn.13348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 01/18/2020] [Accepted: 02/24/2020] [Indexed: 11/30/2022]
Abstract
Previous research documented that furosemide negatively impacted calcium balance for 3 days but did not determine when calcium balance returned to baseline. This study hypothesized that furosemide's impact on calcium would return to control values before 7 days post-administration. Ten mature geldings were assigned to either control (CON, n = 5) or treatment (FUR, n = 5) for the first of two 8-day total collections in crossover design. Treatment horses received one administration of furosemide (1 mg/kg, IV). A 10% sample of pooled faeces and urine from each day was kept. Calcium concentrations in hay, faeces and urine were determined by an atomic absorption spectrophotometer. Data were analysed using mixed-model-repeated measures ANOVA to determine influence of day and treatment. For urine output, FUR urinated twice as much during the 24 hr after administration than CON (p < .001). Horses in FUR excreted more urinary calcium 24-hr post-administration as compared to CON (9.3 ± 1.0 and 4.2 ± 1.0 g, respectively; p < .001). Calcium balance in FUR was more negative on day 1 than day 3 (p < .05). Faecal calcium concentrations remained the same from day 1 to day 7 in CON (6.3 ± 1.3 and 5.5 ± 1.3 g/kg, respectively; p > .10) but were lower in FUR on day 7 as compared to day 1 (4.8 ± 1.3 and 7.3 ± 1.3 g/kg, respectively; p < .001), indicating a potential mechanism to restore calcium balance. These findings corroborate previous studies on furosemide and calcium balance and provide evidence for a possible mechanism to recover net calcium losses after furosemide administration. Since calcium balance returns to baseline in 3 days and previous results have examined frequent, long-term use, furosemide may not negatively impact bone mineral content even if used over long periods.
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Affiliation(s)
- Abby Pritchard
- Department of Animal Science, Michigan State University, East Lansing, Michigan
| | - Brian D Nielsen
- Department of Animal Science, Michigan State University, East Lansing, Michigan
| | - Cara Robison
- Department of Animal Science, Michigan State University, East Lansing, Michigan
| | - Holly Spooner
- Department of Horse Science, Middle Tennessee University, Murfreesboro, Tennessee
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Saastamoinen M, Särkijärvi S, Valtonen E. The Effect of Diet Composition on the Digestibility and Fecal Excretion of Phosphorus in Horses: A Potential Risk of P Leaching? Animals (Basel) 2020; 10:ani10010140. [PMID: 31952257 PMCID: PMC7022629 DOI: 10.3390/ani10010140] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 01/10/2020] [Accepted: 01/12/2020] [Indexed: 11/25/2022] Open
Abstract
Simple Summary This study aimed to examine phosphorus utilization and excretion in feces when typical feeds and forage-based diets are fed. The hypothesis was that feeding regimes might influence phosphorus digestibility and excretion in feces, and therefore the environmental impact of horse husbandry. We also studied the nutrient digestibilities of the diets, as well as the proportion of the soluble fraction of P of the total phosphorus. Horse dung may pose a potential risk of P run-off into the environment if not properly managed. Supplementation with inorganic P should be controlled in the diets of mature horses in light work to decrease the excretion of P in feces. Abstract The main horse phosphorus excretion pathway is through the dung. Phosphorus originating from animal dung and manure has harmful environmental effects on waters. The number of horses has increased in many countries, and several studies have pointed that leaching of P from horse paddocks and pastures are hotspots for high P leaching losses. The hypothesis was that feeding regimes might influence phosphorus digestibility and excretion in feces, and therefore the environmental impact of horse husbandry. A digestibility experiment was conducted with six horses fed six forage-based diets to study phosphorus utilization and excretion in feces. The study method was a total collection of feces. The experimental design was arranged as an unbalanced 6 × 4 Latin Squares. Phosphorus intake increased with an increasing concentrate intake. All studied diets resulted in a positive P balance and, the P retention differed from zero in all except the only-hay diet, in which the intake was lower compared to the other diets. The digestibility of P varied from 2.7 to 11.1%, and supplementing forage-diets with concentrates slightly improved P digestibility (p = 0.024), as it also improved the digestibilities of crude protein (p = 0.002) and organic matter (p = 0.077). The horses excreted an average of 20.9 ± 1.4 g/d P in feces. Excretion was smallest (20.0 g) in horses on a hay-only diet (p = 0.021). The average daily phosphorus excretion resulted in 7.6 kg P per year. The soluble P part of the total P in feces accounted for about 88% of the P excreted in feces, and is vulnerable to runoff losses and may leach into waters. Thus, horse dung may pose a potential risk of P leaching into the environment if not properly managed, and is not less harmful to the environment than that from other farm animals. Supplementation with inorganic P should be controlled in the diets of mature horses in light work to decrease the excretion of P in feces.
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Affiliation(s)
- Markku Saastamoinen
- Production Systems, Natural Resources Institute Finland (Luke), FI-31600 Jokioinen, Finland;
- Correspondence:
| | - Susanna Särkijärvi
- Production Systems, Natural Resources Institute Finland (Luke), FI-31600 Jokioinen, Finland;
| | - Elisa Valtonen
- Department of Animal Science, University of Helsinki, FI-00790 Helsinki, Finland;
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Fowler AL, Pyles MB, Hayes SH, Crum AD, Lawrence LM. Phosphorus excretion by mares post-lactation. J Anim Physiol Anim Nutr (Berl) 2019; 104:1912-1918. [PMID: 31721308 DOI: 10.1111/jpn.13251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 10/02/2019] [Accepted: 10/15/2019] [Indexed: 11/28/2022]
Abstract
Across the equine literature, estimates of true P digestibility range from -23% to 79%. This large range cannot be explained by differences in P intake or phytate-P intake alone. However, differences in endogenous P secretion into the GI tract may explain the variation. In horses, excess absorbed P is not excreted in the urine but is re-secreted into the GI tract, increasing faecal P and leading to estimates of low P digestibility. Thus, accurate estimates of P digestibility can only be obtained if absorbed P is retained in the horse. The objective of this study was to examine P digestibility in post-lactational mares and control mares that were fed similar amounts of P. It was hypothesized that post-lactational mares would have greater P retention and higher apparent P digestibility than control mares. Prior to the study, four lactating and four non-lactating mares were fed a diet that provided 100% of the control mares' P requirement, but only 55% of the lactating mares' P requirement. During the study, both groups were fed P at the rate recommended for non-lactating mares. Post-lactational mares did not retain more P than control mares but tended to excrete more P than control mares (p = .082), presumably due to differences in endogenous P secretion into the GI tract. Metabolic changes occurring during mammary gland involution may have contributed to the increase in P excretion. However, faecal P excretion exceeded P intake in both groups (p = .08) and both groups lost weight during the study. Tissue mobilization during weight loss may have influenced P secretion into the GI tract.
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Affiliation(s)
- Ashley L Fowler
- Department of Animal and Food Sciences, University of Kentucky, Lexington, Kentucky
| | - Morgan B Pyles
- Department of Animal and Food Sciences, University of Kentucky, Lexington, Kentucky
| | - Susan H Hayes
- Department of Animal and Food Sciences, University of Kentucky, Lexington, Kentucky
| | - Andrea D Crum
- Department of Animal and Food Sciences, University of Kentucky, Lexington, Kentucky
| | - Laurie M Lawrence
- Department of Animal and Food Sciences, University of Kentucky, Lexington, Kentucky
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Robison CI, Karcher DM. Analytical bone calcium and bone ash from mature laying hens correlates to bone mineral content calculated from quantitative computed tomography scans. Poult Sci 2019; 98:3611-3616. [DOI: 10.3382/ps/pez165] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Accepted: 03/12/2019] [Indexed: 02/02/2023] Open
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Woodward AD, Nielsen BD, Pritchard A, O'Connor-Robison CI. Determination of Phosphorus and Nitrogen Environmental Load From Six Different Bedding Types Used in an Equine Facility. J Equine Vet Sci 2019. [DOI: 10.1016/j.jevs.2018.10.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Nielsen BD, Eckert SM, Robison CI, Mills J, Peters D, Pease A, Schott II HC. Omeprazole and its impact on mineral absorption in horses. Anim Prod Sci 2017. [DOI: 10.1071/an17323] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Omeprazole is commonly used to treat and prevent ulcers in horses. As a proton-pump inhibitor, and with absorption of calcium dependent on gastric acidity, there is concern that reduction in acidity may interfere with calcium absorption. The present study was conducted to evaluate whether daily omeprazole administration can influence bone health in horses. Prior to commencement of treatment, 10 Standardbred geldings underwent endoscopic examinations for gastric ulcers and to determine gastric pH. They were fed a grass-hay diet. Three-day total collections of faeces and urine were performed to evaluate mineral balance. The left third metacarpus was radiographed to establish baseline values of mineral content by using a radiographic photo-densitometry technique to calculate radiographic bone aluminium equivalence, and blood samples were taken for examination of markers of bone metabolism. The horses were pair-matched and randomly assigned to either a treatment or the control group. Treated horses received omeprazole at the preventative dose (1 mg/kg bodyweight) and control horses received no medication for the duration of the 8-week study. They were housed in box stalls and had daily turnout on drylots. Endoscopy was performed again at the completion of the study, total collections were performed again at the middle and end of the study and blood samples were taken every 2 weeks. No meaningful treatment effects were found for ulcers, gastric pH, mineral balance, radiographic bone aluminium equivalence, or markers of bone formation. Daily administration of omeprazole did not appear to have any negative effects on indices of skeletal health measured in the study.
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Fowler AL, Hansen TL, Strasinger LA, Harlow BE, Lawrence LM. Phosphorus digestibility and phytate degradation by yearlings and mature horses. J Anim Sci 2015; 93:5735-42. [PMID: 26641183 DOI: 10.2527/jas.2015-9139] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Inorganic P is often added to growing horse diets because organic P, or phytate-P, is believed to have lower digestibility. If horses can efficiently digest organic P, then the need for inorganic P may be reduced. Much of the P in grain-based concentrates fed to growing horses is in the form of phytate-P. Little is known about the ability of growing horses to degrade phytate-P or whether horse age affects mineral digestion in horses. The objective of this study was to examine the effect of age on P, Ca, and Mg digestibility as well as phytate-P degradation. Four yearling geldings and 4 mature geldings were fed a diet of alfalfa cubes, timothy cubes, and a pelleted concentrate. The diet contained 0.28% total P and 17.4% of that P was in the phytate form. There was a 14-d diet adaptation period followed by a 4-d fecal collection period. Apparent total tract P digestibility was higher for yearlings than mature geldings ( = 0.036; 7.7 and -6.6% for yearlings and mature geldings, respectively). Phytate-P disappearance was 94.8% and did not differ between ages ( = 0.190). Apparent Ca digestibility was lower in mature geldings ( = 0.043), but apparent Mg digestibility did not differ between ages ( = 0.414). Phytate is broken down in the gastrointestinal tract, but the low P digestibilities suggest that either degradation occurs after the site of P absorption or liberated P is recycled back into the gastrointestinal tract. Yearlings can utilize organic P as well as mature horses; therefore, diets without inorganic P are acceptable for growing horses.
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