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Short communication: Upper critical temperature-humidity index for dairy calves based on physiological stress variables.
Kovács, L; Kézér, F L; Póti, P; Boros, N; Nagy, K.
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  • Kovács L; Research Institute for Animal Breeding, Nutrition and Meat Science, Gesztenyés út 1, Herceghalom H-2053, Hungary. Electronic address: Kovacs.Levente@mkk.szie.hu.
  • Kézér FL; Institute of Animal Husbandry, Faculty of Agricultural and Environmental Science, Szent István University, Páter Károly utca 1, Gödöllo H-2100, Hungary.
  • Póti P; Institute of Animal Husbandry, Faculty of Agricultural and Environmental Science, Szent István University, Páter Károly utca 1, Gödöllo H-2100, Hungary.
  • Boros N; Research Institute for Animal Breeding, Nutrition and Meat Science, Gesztenyés út 1, Herceghalom H-2053, Hungary.
  • Nagy K; Large Animal Clinical Research Group, Hungarian Academy of Science, Szent István University, Üllo, Dóra major H-2225, Hungary.
J Dairy Sci ; 103(3): 2707-2710, 2020 Mar.
Article en En | MEDLINE | ID: mdl-31864752
In this study, upper critical values of the temperature-humidity index (THI) were determined in Holstein bull calves (n = 16) based on noninvasive physiological variables. Meteorological and animal-based data were recorded for a 4-d period following a 24-h habituation. The estimated upper critical THI values based on the assessment of respiratory rate, rectal temperature, ear temperature, heart rate, and salivary cortisol concentrations were 82.4, 88.1, 83.0, 78.3, and 88.8, respectively. We inferred that welfare of young calves may be compromised above a THI of 78 and that calves experience significant heat stress above a THI of 88. Based on the present findings, upper critical THI should be considered to minimize the duration of impaired welfare during summer heat stress episodes.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Bienestar del Animal / Bovinos / Respuesta al Choque Térmico / Calor / Humedad Límite: Animals Idioma: En Revista: J Dairy Sci Año: 2020 Tipo del documento: Article Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Bienestar del Animal / Bovinos / Respuesta al Choque Térmico / Calor / Humedad Límite: Animals Idioma: En Revista: J Dairy Sci Año: 2020 Tipo del documento: Article Pais de publicación: Estados Unidos