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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sul. |
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Data corrente: |
11/12/2024 |
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Data da última atualização: |
11/12/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
FARIAS, C. O.; LAZZARI, J.; CUNHA, I. S. da; GONÇALVES, P. B. D.; GASPERIN, B. G.; LUCIA JUNIOR, T.; SCHMITT, E.; CARDOSO, F. F.; SARUBBI, J.; MONDADORI, R. G. |
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Afiliação: |
CAROLINE OLIVEIRA FARIAS, FEDERAL UNIVERSITY OF PELOTAS; JESSICA LAZZARI, FEDERAL UNIVERSITY OF PELOTAS; ISIS SOARES DA CUNHA, FEDERAL UNIVERSITY OF PELOTAS; PAULO BAYARD DIAS GONÇALVES, FEDERAL UNIVERSITY OF SANTA MARIA; BERNARDO GARZIERA GASPERIN, FEDERAL UNIVERSITY OF PELOTAS; THOMAZ LUCIA JUNIOR, FEDERAL UNIVERSITY OF PELOTAS; EDUARDO SCHMITT, FEDERAL UNIVERSITY OF PELOTAS; FERNANDO FLORES CARDOSO, CPPSUL; JULIANA SARUBBI, FEDERAL UNIVERSITY OF SANTA MARIA; RAFAEL GIANELLA MONDADORI, FEDERAL UNIVERSITY OF PELOTAS. |
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Título: |
Thermotolerance in Angus cattle is related to hair coat characteristics but not to coat color. |
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Ano de publicação: |
2024 |
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Fonte/Imprenta: |
Journal of Thermal Biology, v. 124, e103945, 2024. |
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Idioma: |
Inglês |
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Conteúdo: |
This study evaluated the impact of coat color (CC) and hair coat characteristics (HC) on productive and physiological traits related to thermotolerance in Angus heifers. The goal was to determine if HC and/or CC were reliable indicators of thermotolerance on a large scale for future breeding programs. Ninety-three 15-month-old Angus heifers (52 black, 41 red) were evaluated in three periods on a beef cattle farm in Brazil. Heifers were classified by CC and HC, and body weight, body condition score (BCS), and reproductive tract score (RTS) were compared between groups. In the summer evaluation, surface temperature (infrared thermography), internal temperature (intravaginal sensors), sweating rate, and behavior were assessed in a subset of heifers. Temperature-humidity index (THI) was calculated using meteorological data. The proportion of heifers with short, fine, and smooth hair (HC1) increased (P < 0.05) over the evaluations. Heifers with thick, long, and woolly hair (HC3) had lower (P < 0.05) body weights than those with finer coats, regardless of CC. Black heifers had greater (P < 0.05) puberty rates than red heifers in the first two evaluations. At a THI of 66, black heifers with HC1 exhibited a lower (P < 0.05) internal temperature compared to black heifers with HC3. At a THI of 75, all heifers with HC1 had lower (P < 0.05) internal temperatures, regardless of CC. Red heifers and those with HC3 experienced hyperthermia for longer (P < 0.05) periods. Neither HC nor CC affected (P > 0.05) surface temperatures or sweating rates. At a THI of 72, more black heifers remained standing, suggesting behavioral adaptation. In conclusion, coat color and characteristics influence thermal stress and performance in Angus heifers, though color impact is limited. Internal temperature monitoring effectively determines thermotolerance. In tropical regions, selecting for short, fine, smooth hair may improve heat tolerance. MenosThis study evaluated the impact of coat color (CC) and hair coat characteristics (HC) on productive and physiological traits related to thermotolerance in Angus heifers. The goal was to determine if HC and/or CC were reliable indicators of thermotolerance on a large scale for future breeding programs. Ninety-three 15-month-old Angus heifers (52 black, 41 red) were evaluated in three periods on a beef cattle farm in Brazil. Heifers were classified by CC and HC, and body weight, body condition score (BCS), and reproductive tract score (RTS) were compared between groups. In the summer evaluation, surface temperature (infrared thermography), internal temperature (intravaginal sensors), sweating rate, and behavior were assessed in a subset of heifers. Temperature-humidity index (THI) was calculated using meteorological data. The proportion of heifers with short, fine, and smooth hair (HC1) increased (P < 0.05) over the evaluations. Heifers with thick, long, and woolly hair (HC3) had lower (P < 0.05) body weights than those with finer coats, regardless of CC. Black heifers had greater (P < 0.05) puberty rates than red heifers in the first two evaluations. At a THI of 66, black heifers with HC1 exhibited a lower (P < 0.05) internal temperature compared to black heifers with HC3. At a THI of 75, all heifers with HC1 had lower (P < 0.05) internal temperatures, regardless of CC. Red heifers and those with HC3 experienced hyperthermia for longer (P < 0.05) periods. Neither HC nor CC af... Mostrar Tudo |
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Thesagro: |
Bovino. |
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Thesaurus Nal: |
Heat stress; Thermography. |
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Categoria do assunto: |
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Marc: |
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Registro original: |
Embrapa Pecuária Sul (CPPSUL) |
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