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Neave HW, Jensen EH, Durrenwachter M, Jensen MB. Behavioral responses of dairy cows and their calves to gradual or abrupt weaning and separation when managed in full- or part-time cow-calf contact systems. J Dairy Sci 2024; 107:2297-2320. [PMID: 37944800 DOI: 10.3168/jds.2023-24085] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Accepted: 09/26/2023] [Indexed: 11/12/2023]
Abstract
There is growing interest in managing cow and calf together for a prolonged period, but concerns remain about how best to wean and separate the cow and calf to minimize stress. One approach is to progressively reduce suckling opportunity over time, as in nature. There is also interest in part-time contact (suckling for part of the day) to improve milk yield for the farmer and potentially reduce stress at weaning and separation. The primary objective of this study was to compare the behavioral responses of dairy cows to gradual or abrupt weaning and separation, when managed either full or part time with their calves; a secondary focus was the vocal responses of calves under these management conditions. In a 3 × 2 factorial design (n = 14/ treatment), dairy cows and their calves (n = 84 in 7 blocks of 12 cow-calf pairs) were assigned to one of 3 dam-contact treatments at birth: (1) full-time contact between the dam and calf, apart from milking times (total 23 h/d) (2) part-time contact between the dam and calf, between morning and afternoon milking only (total 10 h/d); (3) no contact, where the dam and calf were separated after leaving the maternity pen and had no further contact. At wk 8, one of 2 weaning treatments was assigned: (1) gradual weaning by reduced contact time (50%, then 25% of original dam-contact time in wk 8 and 9, respectively), or gradually reduced milk allowance for no-contact calves (50%, then 25% of estimated 12-L milk intake in wk 8 and 9, respectively) until complete milk removal and dam-calf separation at wk 10; (2) abrupt weaning where milk removal occurred simultaneously with dam-calf separation at wk 10, or only milk removal for no-contact calves. Overall, part-time contact did not reduce weaning and separation distress for cows or calves for either weaning method. Part-time cows showed reduced behavioral responses to separation (greater lying time and less searching behavior), especially on the day of and 24 h after separation, but they showed a similarly strong vocal response to separation as full-time cows. Part-time calves made substantially more high-pitched vocalizations than full-time calves at 24 h after separation. Furthermore, gradual weaning by reducing contact time did not seem to better prepare cows or calves for complete milk removal and separation; most behavioral and vocal responses occurred on the day of separation for gradual-weaning cows and calves, but 24 h later, the reverse occurred for abrupt-weaning cows and there was no difference between gradual- and abrupt-weaning calves. Our results suggest that part-time contact and gradual-weaning conditions likely resulted in hunger and expectation for reunion, which together may have exaggerated behavioral responses at separation. Temporary daily separations may not have increased independence of cow and calf, and the gradual-weaning method here may not have reduced milk intake by calves. These elements are important criteria to facilitate the weaning process, so future work should explore ways to gradually reduce milk intake and promote social independence of cow and calf to minimize weaning distress.
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Affiliation(s)
- Heather W Neave
- Department of Animal and Veterinary Science, Aarhus University, 8830 Tjele, Denmark.
| | | | - Marine Durrenwachter
- Department of Animal and Veterinary Science, Aarhus University, 8830 Tjele, Denmark
| | - Margit Bak Jensen
- Department of Animal and Veterinary Science, Aarhus University, 8830 Tjele, Denmark.
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Ukyo R, Shinohara A, Koshimoto C, Nagura-Kato GA, Ieiri S, Tsuzuki Y, Sakamoto SH. Long-term behavioral effects of social separation during early life in a social mammal, Octodon degus. Sci Rep 2023; 13:9518. [PMID: 37308511 DOI: 10.1038/s41598-023-36745-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 06/08/2023] [Indexed: 06/14/2023] Open
Abstract
Social separation is thought to induce a strong stress response in social juvenile mammals, but little is known about how this response might vary throughout the development. The present study examines the long-term effects of early-life stress (ELS) induced by social separation on individual behaviors later in life using the social and precocious species Octodon degus. Four experimental groups were established a positive control group of mothers and siblings from six litters comprised the socially housed (SH) group, while pups from seven litters were randomly assigned to three treatments: pups experiencing no separation (NS) treatment while their siblings did; repeated bouts of consecutive separation (CS); intermittent separation (IS). We analyzed the effects of separation treatment on the frequency and duration of freezing, rearing and grooming behaviors. ELS was correlated with higher hyperactivity, and hyperactivity increased with more frequent separation. However, the behavioral trend of the NS group changed to hyperactive in long-term observation. The findings suggest that the NS group was indirectly affected by ELS. In addition, suggesting ELS acts to converge an individual's behavioral tendencies in a certain direction.
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Affiliation(s)
- Rina Ukyo
- Interdisciplinary Graduate School of Agriculture and Engineering, University of Miyazaki, Miyazaki, Japan
| | - Akio Shinohara
- Division of Bio-Resources, Department of Biotechnology, Frontier Science Research Center, University of Miyazaki, 5200 Kihara, Kiyotake-cho, Miyazaki-shi, Miyazaki, 889-1692, Japan
| | - Chihiro Koshimoto
- Division of Bio-Resources, Department of Biotechnology, Frontier Science Research Center, University of Miyazaki, 5200 Kihara, Kiyotake-cho, Miyazaki-shi, Miyazaki, 889-1692, Japan
| | - Goro A Nagura-Kato
- Division of Bio-Resources, Department of Biotechnology, Frontier Science Research Center, University of Miyazaki, 5200 Kihara, Kiyotake-cho, Miyazaki-shi, Miyazaki, 889-1692, Japan
| | - Seiji Ieiri
- Faculty of Agriculture, University of Miyazaki, Miyazaki, 889-2192, Japan
| | - Yasuhiro Tsuzuki
- Faculty of Agriculture, University of Miyazaki, Miyazaki, 889-2192, Japan
| | - Shinsuke H Sakamoto
- Faculty of Agriculture, University of Miyazaki, Miyazaki, 889-2192, Japan.
- Center for Animal Disease Control, University of Miyazaki, Miyazaki, Japan.
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Mwangi F, Dallasheh A, Kalyesubula M, Reicher N, Sabastian C, Mabjeesh SJ. Diet Preference, Feed Efficiency and Expression of the Sodium-Dependent Glucose Transporter Isoform 1 and Sweet Taste Receptors in the Jejunum of Lambs Supplemented with Different Flavours. Animals (Basel) 2023; 13:ani13081417. [PMID: 37106980 PMCID: PMC10135306 DOI: 10.3390/ani13081417] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 04/08/2023] [Accepted: 04/19/2023] [Indexed: 04/29/2023] Open
Abstract
This study investigated the effect of dietary flavour supplements on the preference, feed efficiency and expression of the sweet taste receptor family 1 members 2 and 3 (T1R2 + T1R3), and sodium-glucose linked transporter 1 (SGLT1) genes in the lambs' small intestines. Eight, five-month-old, Israeli crossbred Assaf lambs were offered 16 different non-nutritive commercial flavours in rolled barley and ground corn. Capsicum and sucram were the most preferred non-aroma flavours (p = 0.020), while milky (p < 0.001) was the most preferred powder-aroma flavour. For the metabolic and relative gene expression study, eight lambs were randomly assigned to either sucram, capsicum, a mix containing sucram and capsicum at 1:1 ratio or no flavour for control in a 4 × 2 cross-over design. The total collection of urine (females only), faeces and refusals was carried out, and T1R2, T1R3 and SGLT1 relative gene expression evaluated from the proximal jejunum biopsies. Flavour had no significant effect on the feed intake (p = 0.934), but capsicum increased the average daily weight gain per metabolic body weight (p = 0.049). The T1R3 gene was expressed highest in the mix treatment (1.7; p = 0.005). Collectively, our findings indicate that flavours can be used to motivate feed acceptance and improve the weight gain in lambs.
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Affiliation(s)
- Felista Mwangi
- Department of Animal Science, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 760001, Israel
- Animal Genetics and Nutrition, Veterinary Sciences Discipline, College of Public Health, Medical and Veterinary Sciences, Division of Tropical Health and Medicine, James Cook University, Townsville, QLD 4811, Australia
| | - Areen Dallasheh
- Department of Animal Science, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 760001, Israel
| | - Mugagga Kalyesubula
- Department of Animal Science, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 760001, Israel
| | - Naama Reicher
- Department of Animal Science, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 760001, Israel
| | - Chris Sabastian
- Department of Animal Science, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 760001, Israel
| | - Sameer J Mabjeesh
- Department of Animal Science, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 760001, Israel
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Nielsen SS, Alvarez J, Bicout DJ, Calistri P, Canali E, Drewe JA, Garin‐Bastuji B, Gonzales Rojas JL, Gortazar Schmidt C, Herskin M, Michel V, Miranda Chueca MA, Padalino B, Pasquali P, Roberts HC, Spoolder H, Stahl K, Velarde A, Viltrop A, Jensen MB, Waiblinger S, Candiani D, Lima E, Mosbach‐Schulz O, Van der Stede Y, Vitali M, Winckler C. Welfare of calves. EFSA J 2023; 21:e07896. [PMID: 37009444 PMCID: PMC10050971 DOI: 10.2903/j.efsa.2023.7896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023] Open
Abstract
This Scientific Opinion addresses a European Commission request on the welfare of calves as part of the Farm to Fork strategy. EFSA was asked to provide a description of common husbandry systems and related welfare consequences, as well as measures to prevent or mitigate the hazards leading to them. In addition, recommendations on three specific issues were requested: welfare of calves reared for white veal (space, group housing, requirements of iron and fibre); risk of limited cow–calf contact; and animal‐based measures (ABMs) to monitor on‐farm welfare in slaughterhouses. The methodology developed by EFSA to address similar requests was followed. Fifteen highly relevant welfare consequences were identified, with respiratory disorders, inability to perform exploratory or foraging behaviour, gastroenteric disorders and group stress being the most frequent across husbandry systems. Recommendations to improve the welfare of calves include increasing space allowance, keeping calves in stable groups from an early age, ensuring good colostrum management and increasing the amounts of milk fed to dairy calves. In addition, calves should be provided with deformable lying surfaces, water via an open surface and long‐cut roughage in racks. Regarding specific recommendations for veal systems, calves should be kept in small groups (2–7 animals) within the first week of life, provided with ~ 20 m2/calf and fed on average 1 kg neutral detergent fibre (NDF) per day, preferably using long‐cut hay. Recommendations on cow–calf contact include keeping the calf with the dam for a minimum of 1 day post‐partum. Longer contact should progressively be implemented, but research is needed to guide this implementation in practice. The ABMs body condition, carcass condemnations, abomasal lesions, lung lesions, carcass colour and bursa swelling may be collected in slaughterhouses to monitor on‐farm welfare but should be complemented with behavioural ABMs collected on farm.
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Abduch NG, Pires BV, Souza LL, Vicentini RR, Zadra LEF, Fragomeni BO, Silva RMO, Baldi F, Paz CCP, Stafuzza NB. Effect of Thermal Stress on Thermoregulation, Hematological and Hormonal Characteristics of Caracu Beef Cattle. Animals (Basel) 2022; 12:ani12243473. [PMID: 36552393 PMCID: PMC9774310 DOI: 10.3390/ani12243473] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/02/2022] [Accepted: 12/06/2022] [Indexed: 12/13/2022] Open
Abstract
This study evaluated the influence of environmental temperature on thermoregulation, hormonal, and hematological characteristics in Caracu cattle. Blood samples, hair length, coat and muzzle colors, rectal (RT), and surface temperatures were collected from 48 males and 43 females before (morning) and after sun exposure for eight hours (afternoon). Infrared thermography (IRT) was used to identify superficial temperature that exhibits a high correlation with RT. Hematological parameters, hormone concentrations, RT, and the superficial temperature obtained by IRT that exhibited the highest correlation with RT were evaluated by variance analysis. Regarding IRT, the lower left side of the body (LS) showed the highest correlation with the RT. Interaction between period and sex was observed for LS, cortisol, and eosinophils. Cortisone, progesterone, and RT were influenced by period and sex. Neutrophils and segmented neutrophils were influenced by the period, which showed the highest concentrations after sun exposure. Platelets, leukocytes, lymphocytes, and monocytes were influenced by sex. Heat stress changes several physiological characteristics where males and females exhibited differences in their responses to heat stress. Furthermore, most characteristics evaluated remained within the regular values observed for taurine Creole breeds, showing that Caracu is adapted to tropical climates.
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Affiliation(s)
- Natalya G Abduch
- Centro Avançado de Pesquisa e Desenvolvimento em Bovinos de Corte, Instituto de Zootecnia (IZ), Sertãozinho 14174-000, SP, Brazil
| | - Bianca V Pires
- Departamento de Genética, Faculdade de Medicina de Ribeirão Preto (FMRP), Universidade de São Paulo (USP), Ribeirão Preto 14049-900, SP, Brazil
| | - Luana L Souza
- Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias (FCAV), Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Jaboticabal 14884-900, SP, Brazil
| | - Rogerio R Vicentini
- Departamento de Zoologia, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora 36036-900, MG, Brazil
| | - Lenira El Faro Zadra
- Centro Avançado de Pesquisa e Desenvolvimento em Bovinos de Corte, Instituto de Zootecnia (IZ), Sertãozinho 14174-000, SP, Brazil
| | - Breno O Fragomeni
- Department of Animal Science, University of Connecticut, Storrs, CT 06269, USA
| | | | - Fernando Baldi
- Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias (FCAV), Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Jaboticabal 14884-900, SP, Brazil
| | - Claudia C P Paz
- Centro Avançado de Pesquisa e Desenvolvimento em Bovinos de Corte, Instituto de Zootecnia (IZ), Sertãozinho 14174-000, SP, Brazil
| | - Nedenia B Stafuzza
- Centro Avançado de Pesquisa e Desenvolvimento em Bovinos de Corte, Instituto de Zootecnia (IZ), Sertãozinho 14174-000, SP, Brazil
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Barnhill A, Bernstein J, Faden R, McLaren R, Rieder TN, Fanzo J. Moral Reasons for Individuals in High-Income Countries to Limit Beef Consumption. Food ethics 2022; 7:11. [PMID: 35757112 PMCID: PMC9205278 DOI: 10.1007/s41055-022-00100-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 01/31/2022] [Accepted: 02/01/2022] [Indexed: 11/25/2022]
Abstract
This paper argues that individuals in many high-income countries typically have moral reasons to limit their beef consumption and consume plant-based protein instead, given the negative effects of beef production and consumption. Beef production is a significant source of agricultural greenhouse gas emissions and other environmental impacts, high levels of beef consumption are associated with health risks, and some cattle production systems raise animal welfare concerns. These negative effects matter, from a variety of moral perspectives, and give us collective moral reasons to reduce beef production and consumption. But, as some ethicists have argued, we cannot draw a straight line from the ethics of production to the ethics of consumption: even if a production system is morally impermissible, this does not mean that any given individual has moral reasons to stop consuming the products of that system, given how miniscule one individual’s contributions are. This paper considers how to connect those dots. We consider three distinct lines of argument in support of the conclusion that individuals have moral reasons to limit their beef consumption and shift to plant-based protein, and we consider objections to each argument. This argument applies to individuals in high beef-consuming and high greenhouse gas-emitting high-income countries, though we make this argument with a specific focus on the United States.
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Affiliation(s)
- Anne Barnhill
- Johns Hopkins Berman Institute of Bioethics, Johns Hopkins University, Baltimore, MD USA
| | - Justin Bernstein
- Department of Philosophy, Vrije Universiteit, Amsterdam, The Netherlands
| | - Ruth Faden
- Johns Hopkins Berman Institute of Bioethics, Johns Hopkins University, Baltimore, MD USA
| | - Rebecca McLaren
- Johns Hopkins Berman Institute of Bioethics, Johns Hopkins University, Baltimore, MD USA
| | - Travis N. Rieder
- Johns Hopkins Berman Institute of Bioethics, Johns Hopkins University, Baltimore, MD USA
| | - Jessica Fanzo
- Johns Hopkins Berman Institute of Bioethics, Johns Hopkins University, Baltimore, MD USA
- Berman Institute of Bioethics, Nitze School of Advanced International Studies, Bloomberg School of Public Health, Johns Hopkins University, Washington DC, USA
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Wenker ML, van Reenen CG, Bokkers EA, Mccrea K, de Oliveira D, Sørheim K, Cao Y, Bruckmaier RM, Gross JJ, Gort G, Verwer CM. Comparing gradual debonding strategies after prolonged cow-calf contact: Stress responses, performance, and health of dairy cow and calf. Appl Anim Behav Sci 2022; 253:105694. [DOI: 10.1016/j.applanim.2022.105694] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Omontese B, Zakari F, Webb M. Rumination and Activity Patterns in Angus and Angus-Cross Beef Calves: Influences of Sex, Breed, and Backgrounding Diet. Animals (Basel) 2022; 12. [PMID: 35883385 DOI: 10.3390/ani12141835] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 07/06/2022] [Accepted: 07/13/2022] [Indexed: 11/17/2022] Open
Abstract
The objectives of this study were to evaluate the influences of sex, breed, and backgrounding diet on rumination and activity patterns in Angus and Angus-cross beef calves; and the daily variations in rumination and activity in Angus and Angus-cross beef calves under different backgrounding systems. A total of 62 freshly weaned calves were vaccinated and randomly stratified by sex (heifers and steers), breed (Angus and Angus × Simmental cross), and assigned randomly to 3 backgrounding treatments for 55 days. The peak values for rumination and activity in heifers, steers, Angus, and Angus × Simmental cross occurred during the dark and light phases of the dark/light cycle, respectively. Beef calves backgrounded on cover crops had higher (p < 0.05) rumination (45.33 ± 1.57 min) compared with calves backgrounded on a perennial pasture (43.96 ± 1.47 min) diet. Similarly, drylot calves (24.16 ± 0.68 min) had higher (p < 0.05) activity compared to perennial pasture (23.49 ± 0.72 min). The results showed that sex and breed did not influence rumination and activity of Angus and Angus-cross beef calves during the study period. We concluded that the time of the day and backgrounding diet influenced rumination and activity patterns of Angus and Angus-cross beef calves.
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de Souza Teixeira O, Kuczynski da Rocha M, Gil Sessim A, Dezordi Sartori E, Machado da Rosa Y, Muniz de Oliveira MC, Abud Lima J, Andrighetto Canozzi ME, Urdapilleta Tarouco J, de Faria Valle S, McManus C, Jardim Barcellos JO. Weaning at 30, 75 and 180 days: Comparison between immune responses of beef calves. Res Vet Sci 2021; 138:53-61. [PMID: 34111714 DOI: 10.1016/j.rvsc.2021.06.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 01/11/2021] [Revised: 05/10/2021] [Accepted: 06/01/2021] [Indexed: 10/21/2022]
Abstract
The interruption of the maternal-filial bond in young calves can alter the physiological responses due to increased stress at this moment. Therefore, we aimed to analyze the association between age at weaning and the immune responses of 64 beef calves weaned abruptly. The animals were distributed in three weaning (W) treatments: hyper-early (W30), early (W75) and conventional (W180). The treatments agree with the weaning ages used in cow-calf systems in South America. Blood samples were collected of all experimental animals on the day of weaning and days 1, 2 and 7 post-weaning day of the three treatments. Blood samples were used to analyze hematological variables, total plasma proteins (TPP), fibrinogen, serum amyloid A protein (SAA) and cortisol. The variables analyzed were influenced by the sampling day (P < 0.001) and the calf gender (P < 0.05), and an interaction between treatment x sampling day was observed. Over the study period, high serum cortisol levels were observed for W30 calves. The serum amyloid A protein was significantly influenced by sampling day. When compared to W180 calves, W30 and W75 animals showed prolonged concentrations in plasma fibrinogen. In addition, they presented neutrophilia and lymphopenia during the 180-187 days period, which resulted in a greater neutrophil:lymphocyte ratio (N:L ratio). Calf gender resulted in changes in the number of blood leukocytes (P < 0.05). This result provides an alert for weaning at an early age, indicating that different management strategies must be tested to minimize physiological instabilities in critical periods of the life of animals.
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Affiliation(s)
- Odilene de Souza Teixeira
- Department of Science Animal, Universidade Federal do Rio Grande do Sul, Ave. Bento Gonçalves, 91540000 Porto Alegre, Brazil.
| | - Marcela Kuczynski da Rocha
- Department of Science Animal, Universidade Federal do Rio Grande do Sul, Ave. Bento Gonçalves, 91540000 Porto Alegre, Brazil
| | - Amir Gil Sessim
- Department of Science Animal, Universidade Federal do Rio Grande do Sul, Ave. Bento Gonçalves, 91540000 Porto Alegre, Brazil
| | - Everton Dezordi Sartori
- Department of Science Animal, Universidade Federal do Rio Grande do Sul, Ave. Bento Gonçalves, 91540000 Porto Alegre, Brazil
| | - Yago Machado da Rosa
- Department of Science Animal, Universidade Federal do Rio Grande do Sul, Ave. Bento Gonçalves, 91540000 Porto Alegre, Brazil
| | | | - Julia Abud Lima
- Department of Science Animal, Universidade Federal do Rio Grande do Sul, Ave. Bento Gonçalves, 91540000 Porto Alegre, Brazil
| | - Maria Eugênia Andrighetto Canozzi
- Instituto Nacional de Investigación Agropecuaria, Programa Producción de Carne y Lana, Estación Experimental INIA La Estanzuela, Ruta 50 km 11, 39173, Colonia, Uruguay
| | - Jaime Urdapilleta Tarouco
- Department of Science Animal, Universidade Federal do Rio Grande do Sul, Ave. Bento Gonçalves, 91540000 Porto Alegre, Brazil
| | - Stella de Faria Valle
- Department of Pathology and Veterinary Clinic, Universidade Federal do Rio Grande do Sul, Ave. Bento Gonçalves, 91540000 Porto Alegre, RS, Brazil
| | - Concepta McManus
- Institute of Biological Sciences, Universidade de Brasília, 70910-900 Brasília, DF, Brazil
| | - Júlio Otávio Jardim Barcellos
- Department of Science Animal, Universidade Federal do Rio Grande do Sul, Ave. Bento Gonçalves, 91540000 Porto Alegre, Brazil
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