Thermal comfort zone of Santa Ines sheep based on physiological responses

Revista Brasileira de Zootecnia

Carvalho, Gleidson Giordano Pinto de²  Eustáquio Filho, Antônio¹  Teodoro, Sônia Martins¹  Souza, Luiz Eduardo Barreto de¹  Silva, Marcos Welber Ribeiro da¹  Chaves, Modesto Antônio¹  Santos, Paulo Eduardo Ferreira dos¹  Murta, Rogério Mendes¹ 

[1] Universidade Estadual do Sudoeste da Bahia, Itapetinga;UFBA, Salvador

关键词: bioclimatic chamber;    heat stress;    lambs    Introdução Em comparação às regiões de clima temperado;    as regiões tropicais apresentam baixa produtividade animal;    resultado de vários efeitos do ambiente;    que se encontra acima do limite ideal para ótimo desempenho do rebanho;   

DOI  :  10.1590/S1516-35982011000800026

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The objective was to establish the thermal comfort zone for Santa Ines sheep by comparing the physiological responses at different options of temperatures in bioclimatic chamber. The experiment lasted 71 days and was conducted with the use of seven Santa Ines lambs per treatment. The treatments were temperature ranges of 10, 15, 20, 25, 30, 35 and 40ºC with tree replicates (exposure days) and a five-day interval. The experimental design was completely randomized. Meteorological data collected were: dry bulb temperature; wet bulb temperature and black globe temperature. Physiological data analyzed were: respiratory rate, heart rate, rectal temperature, tympanic temperature, sweating rate and blood pressure. The physiological mechanisms of heat dissipation are shown to be effective in maintaining the homeothermy of the animals studied at all temperatures. The temperature of 25ºC can be determined as the thermal comfort zone for Santa Ines lambs in an environment with relative humidity of 65%.

【 授权许可】

CC BY-NC