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Factors affecting heat tolerance in crossbred cattle in central Brazil

This study compared the adaptation traits in common crosses of crossbred dairy cattle in central Brazil. Twenty animals of each of three genetic groups were used: zebu (Bos indicus), Simmental x Zebu (SZ) and Holstein x Zebu (HZ). The test measured variations in rectal temperature (RT), respiration...

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Main Authors:	Pimentel, Concepta Margaret McManus, Louvandini, Helder, Paim, Tiago do Prado, Silva, Flávia Cristina Paula e, Bernal, Francisco Ernesto Moreno
Format:	Artigo
Language:	English
Published:	Universidade Federal de Goiás 2017
Subjects:	Batimento cardíaco Frequência respiratória Bovino de leite Temperatura retal Leite - produção
Online Access:	http://repositorio.unb.br/handle/10482/29422 https://dx.doi.org/10.1590/1809-6891v15i28726
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spelling	ir-10482-294222019-08-20T11:33:46Z Factors affecting heat tolerance in crossbred cattle in central Brazil Fatores que afetam a tolerância ao calor em gado mestiço no Brasil central Pimentel, Concepta Margaret McManus Louvandini, Helder Paim, Tiago do Prado Silva, Flávia Cristina Paula e Bernal, Francisco Ernesto Moreno Batimento cardíaco Frequência respiratória Bovino de leite Temperatura retal Leite - produção This study compared the adaptation traits in common crosses of crossbred dairy cattle in central Brazil. Twenty animals of each of three genetic groups were used: zebu (Bos indicus), Simmental x Zebu (SZ) and Holstein x Zebu (HZ). The test measured variations in rectal temperature (RT), respiration rate (RR) and heart rate (HR) of animals in the shade and after exposure to the sun, as well as mean daily milk production throughout the lactation period. The procedure was repeated three times. There were significant interactions between test group and genetic group for the traits investigated and the correlations among traits were low. The RR of the crossbred groups may be controlling body temperature in such a way as not to cause an increase in RT. Milk production influenced RR in crossbred cows exposed to the sun, confirming their poorer adaptation in comparison with zebu cows. We observed that the adaptation can be measured in terms of production within the same genetic group. In conclusion, the crosses with European breeds produced more milk than zebu, although they were influenced by heat/solar radiation. Este estudo comparou as características de adaptação em cruzamentos comuns de gado leiteiro mestiços no Brasil central. Foram utilizados vinte animais de cada um dos três grupos genéticos: Zebu (Bos indicus), Simental x Zebu (SZ) e Holandês x Zebu (HZ). Foi medida a variação da temperatura retal (RT), frequência respiratória (RR) e frequência cardíaca (HR) dos animais à sombra e depois da exposição ao sol, bem como a produção média diária de leite durante todo o período de lactação. O procedimento foi repetido três vezes. Houve interações significativas entre o grupo teste e grupo genético para as características investigadas e as correlações entre as características foram baixas. A RR dos grupos mestiços parece controlar a temperatura corporal de maneira que não cause um aumento na RT. A produção de leite influenciou RR em vacas mestiças expostas ao sol, o que confirma a adaptação mais pobre em comparação com vacas zebuínas. Observou-se que a adaptação pode ser medida em termos de produção dentro do mesmo grupo genético. Em conclusão, os cruzamentos com raças europeias produziram mais leite do que o zebu, apesar de terem sido influenciados pelo calor da radiação / solar. 2017-12-07T05:09:10Z 2017-12-07T05:09:10Z 2014 Artigo MCMANUS, Concepta Margaret et al. Factors affecting heat tolerance in crossbred cattle in central Brazil. Ciência Animal Brasileira, Goiânia, v. 15, n. 2, p. 152-158, jun. 2014. DOI: http://dx.doi.org/10.1590/1809-6891v15i28726. Disponível em: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1809-68912014000200005&lng=en&nrm=iso. Acesso em: 19 ago. 2019. http://repositorio.unb.br/handle/10482/29422 https://dx.doi.org/10.1590/1809-6891v15i28726 en Acesso Aberto Ciência Animal Brasileira - All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Atribution License (CC BY ). Fonte: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1809-68912014000200005&lng=en&tlng=en . Acesso em: 19 ago. 2019. application/pdf Universidade Federal de Goiás
institution	REPOSITORIO UNB
collection	REPOSITORIO UNB
language	English
topic	Batimento cardíaco Frequência respiratória Bovino de leite Temperatura retal Leite - produção
spellingShingle	Batimento cardíaco Frequência respiratória Bovino de leite Temperatura retal Leite - produção Pimentel, Concepta Margaret McManus Louvandini, Helder Paim, Tiago do Prado Silva, Flávia Cristina Paula e Bernal, Francisco Ernesto Moreno Factors affecting heat tolerance in crossbred cattle in central Brazil
description	This study compared the adaptation traits in common crosses of crossbred dairy cattle in central Brazil. Twenty animals of each of three genetic groups were used: zebu (Bos indicus), Simmental x Zebu (SZ) and Holstein x Zebu (HZ). The test measured variations in rectal temperature (RT), respiration rate (RR) and heart rate (HR) of animals in the shade and after exposure to the sun, as well as mean daily milk production throughout the lactation period. The procedure was repeated three times. There were significant interactions between test group and genetic group for the traits investigated and the correlations among traits were low. The RR of the crossbred groups may be controlling body temperature in such a way as not to cause an increase in RT. Milk production influenced RR in crossbred cows exposed to the sun, confirming their poorer adaptation in comparison with zebu cows. We observed that the adaptation can be measured in terms of production within the same genetic group. In conclusion, the crosses with European breeds produced more milk than zebu, although they were influenced by heat/solar radiation.
format	Artigo
author	Pimentel, Concepta Margaret McManus Louvandini, Helder Paim, Tiago do Prado Silva, Flávia Cristina Paula e Bernal, Francisco Ernesto Moreno
author_sort	Pimentel, Concepta Margaret McManus
title	Factors affecting heat tolerance in crossbred cattle in central Brazil
title_short	Factors affecting heat tolerance in crossbred cattle in central Brazil
title_full	Factors affecting heat tolerance in crossbred cattle in central Brazil
title_fullStr	Factors affecting heat tolerance in crossbred cattle in central Brazil
title_full_unstemmed	Factors affecting heat tolerance in crossbred cattle in central Brazil
title_sort	factors affecting heat tolerance in crossbred cattle in central brazil
publisher	Universidade Federal de Goiás
publishDate	2017
url	http://repositorio.unb.br/handle/10482/29422 https://dx.doi.org/10.1590/1809-6891v15i28726
_version_	1648649375138709504
score	13.657419

Factors affecting heat tolerance in crossbred cattle in central Brazil

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