Heat tolerance responses in a Bos taurus cattle herd raised in a Brazilian climate

Knowledge of thermoregulatory responses in taurine cattle contribute to identification of animals most adapted to heat and productive when raised under Brazilian climate. The objectives were to verify the morphological and physiological responses related to adaptation to heat of taurine breeds raise...

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Bibliographic Details
Published in:Journal of thermal biology 2019-04, Vol.81, p.162-169
Main Authors: Baena, Marielle Moura, Costa, Adriano Carvalho, Vieira, Gabriela Rodrigues, Rocha, Renata de Fátima Bretanha, Ribeiro, Andrea Roberto Bueno, Ibelli, Adriana Mércia Guaratini, Meirelles, Sarah Laguna Conceição
Format: Article
Language:English
Subjects:
Adaptability
Adaptation
Bovidae
Hair
Heat
Heat tolerance
Morphology
Physiology
Respiration
Seasons
Taurine cattle
Thermoregulation
Tropical
Winter
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Summary:Knowledge of thermoregulatory responses in taurine cattle contribute to identification of animals most adapted to heat and productive when raised under Brazilian climate. The objectives were to verify the morphological and physiological responses related to adaptation to heat of taurine breeds raised under in Brazilian meteorological conditions in different seasons of the year and day periods, and to detect differences within and between breeds to know breed is most adapted. Measurements were made of 74 young bulls (n = 31 Angus; n = 43 Simmental) for the morphological traits: hair length (HL), number of hairs (NH), and coat thickness (CT); and for the physiological traits: respiratory rate (RR) and hair coat surface temperature (ST). The temperature-humidity index (THI) was calculated. The data were subjected to analyses of variance, cluster analysis, and principal component analysis (PCA). The THI (
ISSN:0306-4565
1879-0992
DOI:10.1016/j.jtherbio.2019.02.017