Fecha/hora: 15/06/2024 21:17:04

Biblioteca(s): 	INIA La Estanzuela.	
Fecha corriente: 	15/06/2021	
Fecha de la última actualización: 	15/06/2021	
Autoria: 	DE SOUZA TEIXEIRA, O.; KUCZYNSKI DA ROCHA ,M.; GIL SESSIM, A.; DEZORDI SARTORI. E.; MACHADO DA ROSA, Y.; MUNIZ DE OLIVEIRA, M.C.; ABUD LIMA, J.; CANOZZI, M.E.A.; URDAPILLETA TAROUCO, J.; DE FARIA VALLE, S.; MCMANUS, C.; BARCELLOS, J.O.J.	
Afiliación: 	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.; MARIA CAROLINA MUNIZ DE OLIVEIRA, 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.; MARÍA EUGENIA ANDRIGHETTO CANOZZI, INIA (Instituto Nacional de Investigación Agropecuaria), 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, Brazi; JÚLIO OTÁVIO JARDIM BARCELLOS, Department of Science Animal, Universidade Federal do Rio Grande do Sul, Ave. Bento Gonçalves, 91540000 Porto Alegre, Brazil.	
Título: 	Weaning at 30, 75 and 180 days: Comparison between immune responses of beef calves.	
Año de publicación: 	2021	
Fuente/Imprenta: 	Research in Veterinary Science, September 2021, Volume 138, Pages 53-61. Doi: https://doi.org/10.1016/j.rvsc.2021.06.002	
DOI: 	10.1016/j.rvsc.2021.06.002	
Idioma: 	Inglés	
Notas: 	Article history: Received 11 January 2021/ Revised 10 May 2021/ Accepted 1 June 2021/ Available online 2 June 2021.	
Contenido: 	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.	
Palabras-Clave: 	Age at weaning; Beef cattle; Cortisol; Hematology; Stress.	
Thesagro: 	GANADO DE CARNE.	
Categoría del tema: 	L01 Ganadería	
Registro original: 	INIA La Estanzuela (LE)	
Ejemplares: 	LE - (103387-1) - PXI - AP - DD - PP/Research in Veterinary Science/2021 -  -  - DIS