Effect of high temperature on physiological parameters of Nelore (Bos taurus indicus) and Caracu (Bos taurus taurus) cattle breeds

Autor(es)

Lima, Sergio B. G. P. N. P. ^[1] ; Stafuzza, Nedenia Bonvino ^[1] ; Pires, Bianca V. ^[2] ; Bonilha, Sarah F. M. ^[1] ; Cyrillo, Joslaine N. S. G. ^[1] ; Negrao, Joao A. ^[3] ; Paz, Claudia C. P. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Anim Sci Inst, Beef Cattle Res Ctr, BR-14160900 Sertaozinho, SP - Brazil

^[2] Univ Sao Paulo, Dept Genet, Ribeirao Preto Med Sch FMRP, BR-14034990 Ribeirao Preto, SP - Brazil

^[3] Univ Sao Paulo, FZEA, Dept Anim Sci, Coll Anim Sci & Food Engn, BR-13630000 Pirassununga, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: TROPICAL ANIMAL HEALTH AND PRODUCTION; v. 52, n. 5 MAR 2020.
• Citações Web of Science: 3

Resumo

The climate-related problems that affect animal production in tropical countries have encouraged seeking solutions to increase herd productivity and one alternative is the use of breeds adapted to high-temperature environments. The objective of this study was to evaluate the effect of temperature on 77 Caracu and Nelore males submitted to three different environments: morning period (8:00 to 10:00 AM), afternoon in the sun, and afternoon in a shaded environment (11:00 AM to 1:00 PM). The following physiological parameters were measured in each treatment: heart and respiration rates, rectal and dorsal surface temperatures, and cortisol level. The data were analyzed with the MIXED procedure (SAS) and the model included the fixed effects of treatment (morning, sun, and shade), breed (Nelore and Caracu), month of measurement (December and February), and the interaction between effects. A higher dorsal surface temperature was observed in animals of both breeds in the sun treatment compared with the shade treatment. Caracu animals had a higher dorsal surface temperature than Nelore animals, which probably caused the higher rectal temperature observed in the sun treatment compared with the shade treatment in both breeds over the 2 months of the study. All physiological parameters measured in this study were efficient to detect the thermal stress in both breeds. Despite the variations in rectal temperature observed during the treatments, the animals of the two breeds exhibited no significant changes in heart rate, respiration rate, and cortisol level for the maintenance of thermal homeostasis. In conclusion, both breeds were considered tolerant to sun exposure, demonstrating adaptation of these animals to high-temperature environments, without evidence of harm to its health and welfare. (AU)

• Processo FAPESP: 18/19216-7 - Análise integrada do transcriptoma e proteoma para identificação de biomarcadores para eficiência alimentar, termotolerância e resistência à carrapato em bovinos Caracu
• Beneficiário: Nedenia Bonvino Stafuzza
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 19/10438-0 - Análise integrada do transcriptoma e proteoma para identificação de biomarcadores para eficiência alimentar, termotolerância e resistência à carrapato em bovinos Caracu
• Beneficiário: Nedenia Bonvino Stafuzza
• Modalidade de apoio: Bolsas no Brasil - Jovens Pesquisadores
• Processo FAPESP: 16/19222-1 - Perfil da expressão de genes associados ao estresse térmico em Nelore e Caracu
• Beneficiário: Claudia Cristina Paro de Paz
• Modalidade de apoio: Auxílio à Pesquisa - Regular