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The objective of this study was to determine the physiological response of two caprine races from the Brazilian semiarid, submitted to a controlled thermal conditions in a climatic chamber. Twelve male animals were used, 6 Canindes e 6 Moxotos, with mean weight of 19,6 ± 1,9 kg and 20,4 ± 1,6 kg distributed in a completely randomized design, in factorial scheme (2 x 4), two races and four temperature levels (20.6, 24.8, 27.8 and 31,6°C), with six repetitions, with mean relative air humidity of 60 ± 5% and wind speed of 0.5 m s-1. In the temperature between 20.6 and 27.8°C the mean respiratory frequency (25.7 mov min-1) and cardiac frequency (76.7 mov min-1) of the animals were within normality, however, at 31.6°C, occurred elevation to 134.5 and 104.3 mov min-1 for the respiratory and cardiac frequency, respectively. Rectal temperature was similar in all temperatures with average of 39.5°C, within the range of normality for the species. The superficial temperature raised with the increase of the environment temperature. The range of temperature between 20.6 and 27.8 °C can be considered within the thermal comfort zone for native Moxoto and Caninde caprines.

Respostas fisiológicas de caprinos nativos mantidos em temperatura termoneutra e em estresse térmico