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Title: | Effects of thermal environment on dairy cattle under a grazing system in the Western Amazon, Brazil |
Other Titles: | Efeitos do ambiente térmico em bovinos leiteiros em sistema de pastejo na Amazônia Ocidental, Brasil |
Keywords: | Climate change Ambiance Animal welfare Heat stress Dairy cow Alterações climáticas Ambiência Bem-estar animal Estresse por calor Vaca leiteira |
Issue Date: | Dec-2022 |
Publisher: | Universidade Federal de Minas Gerais (UFMG), Escola de Veterinária |
Citation: | OLIVEIRA, A. V. D. et al. Evaluation of the thermal environment in dairy cattle under a grazing system in the Western Amazon, Brazil. Arquivo Brasileiro de Medicina Veterinária e Zootecnia, [Belo Horizonte], v. 74, n. 6, p. 1119-1126, Nov./Dec. 2022. DOI: 10.1590/1678-4162-12743. |
Abstract: | This study aimed to evaluate the thermal conditions to which animals are exposed and their effect on the comfort/discomfort of dairy herds in a grazing system in the municipality of Sena Madureira, Acre State, Brazil. Eight farms and a total of 113 lactating crossbred cows were evaluated. Dry-bulb temperature (DBT, °C), relative humidity (RH, %), black globe temperature (BGT, °C), and wind speed (v, km h−1) were measured in January, February, and March (rainy season) to calculate temperature-humidity index (THI), black globe-humidity index (GTWBI), and radiant heat load (RHL). Moreover, the animals were measured for the physiological variables: rectal temperature (RT), heart rate (HR), and respiratory rate (RR). Significant differences (P<0.05) were observed for THI, GTWBI, and RHL. THI reached a mean value of 80 on farm G in January. Farm F had a GTWBI value of 79 in February. RHL reached the highest value (510 W m−2). RT and HR showed no differences among the analyzed months. Thus, the environmental conditions in which dairy cows are housed at milking time rarely promoted thermal discomfort, with farm G being the most affected by THI. |
URI: | http://repositorio.ufla.br/jspui/handle/1/58875 |
Appears in Collections: | DEG - Artigos publicados em periódicos |
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ARTIGO_Evaluation of the thermal environment in dairy cattle under a grazing system in the Western Amazon, Brazil.pdf | 718,77 kB | Adobe PDF | View/Open |
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