| Autor: |
Abduch NG; Centro Avançado de Pesquisa e Desenvolvimento em Bovinos de Corte, Instituto de Zootecnia (IZ), Sertãozinho 14174-000, SP, Brazil., Pires BV; Departamento de Genética, Faculdade de Medicina de Ribeirão Preto (FMRP), Universidade de São Paulo (USP), Ribeirão Preto 14049-900, SP, Brazil., Souza LL; Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias (FCAV), Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Jaboticabal 14884-900, SP, Brazil., Vicentini RR; Departamento de Zoologia, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora 36036-900, MG, Brazil., Zadra LEF; Centro Avançado de Pesquisa e Desenvolvimento em Bovinos de Corte, Instituto de Zootecnia (IZ), Sertãozinho 14174-000, SP, Brazil., Fragomeni BO; Department of Animal Science, University of Connecticut, Storrs, CT 06269, USA., Silva RMO; Zoetis, 04710-230, São Paulo, SP, Brazil., Baldi F; Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias (FCAV), Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Jaboticabal 14884-900, SP, Brazil., Paz CCP; Centro Avançado de Pesquisa e Desenvolvimento em Bovinos de Corte, Instituto de Zootecnia (IZ), Sertãozinho 14174-000, SP, Brazil., Stafuzza NB; Centro Avançado de Pesquisa e Desenvolvimento em Bovinos de Corte, Instituto de Zootecnia (IZ), Sertãozinho 14174-000, SP, Brazil. |
| Abstrakt: |
This study evaluated the influence of environmental temperature on thermoregulation, hormonal, and hematological characteristics in Caracu cattle. Blood samples, hair length, coat and muzzle colors, rectal (RT), and surface temperatures were collected from 48 males and 43 females before (morning) and after sun exposure for eight hours (afternoon). Infrared thermography (IRT) was used to identify superficial temperature that exhibits a high correlation with RT. Hematological parameters, hormone concentrations, RT, and the superficial temperature obtained by IRT that exhibited the highest correlation with RT were evaluated by variance analysis. Regarding IRT, the lower left side of the body (LS) showed the highest correlation with the RT. Interaction between period and sex was observed for LS, cortisol, and eosinophils. Cortisone, progesterone, and RT were influenced by period and sex. Neutrophils and segmented neutrophils were influenced by the period, which showed the highest concentrations after sun exposure. Platelets, leukocytes, lymphocytes, and monocytes were influenced by sex. Heat stress changes several physiological characteristics where males and females exhibited differences in their responses to heat stress. Furthermore, most characteristics evaluated remained within the regular values observed for taurine Creole breeds, showing that Caracu is adapted to tropical climates. |
