Variáveis fisiológicas e componentes sanguíneos de ovinos nativos mantidos em ambiente controlado.

Abstract

The objective of the research was to determine the physiological, biochemical and blood behavior of sheep kept in comfort and thermal stress through physiological evaluations, hormonal and biochemical profiles, where the animals were kept at temperatures of 20, 24, 28, 32 and 36°C in a controlled environment (climatic chamber) and relative humidity of 60. Six male goats of each breed (Santa Inês, Morada Nova, No racial pattern defined -SRD and Soinga) were used, with an average age of five months and average weight of 18.5 2.9± kg, confined and receiving food and water ad libitum. The experimental design used will be completely randomized (DIC), with three breeds/genetic group, four temperatures and six replications. The animals were exposed to each temperature for 15 consecutive days, with 10 days of adaptation and 5 days of data collection. Between each treatment, the animals were kept outdoors (open climatic chamber) for five days to eliminate the residual effect. Climatological data, physiological variables (respiratory and cardiac movements, rectal and surface temperature), biochemical and hormonal variables (cortisol, T3 and T4) of the animals were recorded. With these data, it was possible, through mathematical equations, to compare breeds, temperatures and determine the thermal comfort zone for sheep. The groups were similar in terms of adaptation level, even though the new address had a low value for rectal temperature and heart rate, and they changed abruptly considering the evaluated temperatures and from 28°C onwards, the variables change to more or less in order to adaptation. The results of this study are important as a reference for the clinical analysis of the hematological parameters of hair sheep from Northeast Brazil, since, in most cases, data obtained from exotic sheep from temperate climates with zootechnical characteristics well differentiated from the breeds are used as a reference hairless.