Thermoregulatory response of black or red lactating Holstein cows in the hot and cold season in southern Brazil.

Autor: Lazzari J; Veterinary Medicine Graduate Program, Federal University of Pelotas, Av. Eliseu Maciel, Capão do Leão, RS, Brazil. Electronic address: jelazzari@hotmail.com., Isola JVV; Aging & Metabolism Program, Oklahoma Medical Research Foundation, 825 NE 13th St, Oklahoma City, OK, 73104, USA. Electronic address: isolaj@omrf.org., Szambelan VL; Department of Animal Science, Federal University of Santa Maria, Av. Independência, 3751, Palmeira Das Missões, RS, Brazil. Electronic address: nessa.szambelan@gmail.com., Menegazzi G; Department of Animal Science, Faculty of Agronomy, University of the Republic, Ruta 3 Km 363, Paysandú, Uruguay. Electronic address: gmenegazzi@fagro.edu.uy., Busanello M; Department of Agricultural Sciences, High Uruguay and Missions Regional Integrated University, Av. Assis Brasil, 709, Frederico Westphalen, RS, Brazil. Electronic address: marcosbusanello@hotmail.com., Rovani MT; Department of Animal Medicine, Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 9090, Agronomia, Porto Alegre, RS, Brazil. Electronic address: mtrovani@gmail.com., Sarubbi J; Department of Animal Science, Federal University of Santa Maria, Av. Independência, 3751, Palmeira Das Missões, RS, Brazil. Electronic address: jusarubbi.ufsm@hotmail.com., Schmitt E; Department of Veterinary Clinics, Federal University of Pelotas, Av. Eliseu Maciel, Capão do Leão, RS, Brazil. Electronic address: schmitt.edu@gmail.com., Ferreira R; Department of Animal Science, Santa Catarina State University, Av. Luiz de Camões, 2090, Chapecó, SC, Brazil. Electronic address: rferreirasul@gmail.com., Gonçalves PBD; Department of Physiology and Pharmacology, Federal University of Santa Maria, Santa Maria, RS, Brazil. Electronic address: bayard@ufsm.br., Gasperin BG; Department of Animal Pathology, Federal University of Pelotas, Av. Eliseu Maciel, Capão do Leão, RS, Brazil. Electronic address: bggasperin@gmail.com., Mondadori RG; Department of Morphology, Federal University of Pelotas, Av. Eliseu Maciel, Capão do Leão, RS, Brazil. Electronic address: rgmondadori@gmail.com.
Jazyk: angličtina
Zdroj: Journal of thermal biology [J Therm Biol] 2024 Apr; Vol. 121, pp. 103833. Date of Electronic Publication: 2024 Mar 21.
DOI: 10.1016/j.jtherbio.2024.103833
Abstrakt: Dairy cows in pasture-based systems are more susceptible to heat stress. Holstein cows have the black or red phenotypes, the latter having lower absorbance of solar radiation. Therefore, the study's objective was to evaluate whether cows with red (R) coats are more resistant than black (B) cows to hot weather in a subtropical climate. R and B lactating Holstein cows were evaluated during the cold and hot seasons for internal and surface temperature and sweating rate. In the cold season, body temperature (n = 9/group) did not differ between groups, but the average superficial temperature (n = 13/group) was lower in R cows (B: 30.9 ± 0.3 °C; RW: 29.6 ± 0.3 °C; p = 0.02). In the hot season, under mild to moderate heat stress, mean body temperature (n = 9/group) of R cows was lower (B: 38.75 ± 0.01 °C; R: 38.62 ± 0.1 °C; p=<0.0001), whereas no difference was observed in superficial temperature (n = 17/group). The maximum internal temperature and sweating rate (n = 11/group), measured in the hot season, and the number of evaluations in hyperthermia in both seasons did not differ. Therefore, there were differences in thermoregulation between phenotypes under mild to moderate heat stress conditions. However, considering that only discrete differences were observed, the red and white coat is unlikely to benefit the Holstein cow's welfare under mild to moderate thermal stress.
Competing Interests: Declaration of competing interest The authors declare no conflict of interest, financial or otherwise.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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