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The objective of this study was to evaluate the physiological responses of Dorper sheep reared in climatic conditions in the Mid-North region of Brazil. For this, were used 12 adult females weighing 35.00±5.00 kg, distributed in a completely randomized design, with four treatments consisting by different times of the day, and 12 repetitions per treatment. The physiological parameters, respiratory rate (RF), heart rate (HR), rectal temperature (TR) and mean surface temperature (TSM) of the animals were measured, as well as the climatic variables, temperature (TA) and relative air humidity (AU). The black globe temperature and humidity index (ITGU) was calculated using the Brazilian Journal of Development Braz. J. of Develop., Curitiba, v. 6, n. 9, p. 66805-66813, sep. 2020. ISSN 2525-8761 66807 black globe thermometer temperature and dew point values. The analysis revealed a time of day effect (P<0.05) for the climatic variables, the ITGU and the studied physiological parameters. The animals presented the highest averages for the TSM parameter at 11:00 am to 11:30 am and from 2:30 pm to 3:00 pm. However, there was no significant difference (P>0.05) between the times of the day for the FR and HR parameters. Animals reared in the climatic conditions of the Mid-North region of Brazil were able to maintain body temperature within the average basal limit to the detriment of increased respiratory and heart rates.

brazilian journal of development

CARACTERÍSTICAS TERMORREGULADORAS DE OVINOS DA RAÇA DORPER CRIADOS EM CONDIÇÕES CLIMÁTICAS DE MEIO-NORTE DO BRASIL / THERMOREGULATORY CHARACTERISTICS OF DORPER SHEEP REARED IN CLIMATIC CONDITIONS IN THE MID-NORTH REGION OF BRAZIL