Abstract
The aim of this study was to evaluate the physiological responses of Santa Ines and its crossbreeds with Suffolk races and Ile de France in Piracicaba, Brazil. Eighteen ewes were used assigned to a completely randomized design in a factorial diagram (3 x 3, 3 breed group: Santa Ines (SI); ½ Santa Ines + ½ Suffolk (Su x SI), and ½ Santa Ines + ½ Ile de France (Ile x SI) and 3 times of observation: 07:00, 13:00 and 19:00 hours) with 6 repetitions. The ewes were used to evaluate: rectal temperature (RT), superficial temperature (ST), eardrum temperature (ET) and respiratory frequency (RF). The ST showed difference (P 0.05) between the 13:00 and the 19:00. The crossbreeding Ile x SI show greater heat tolerance than Su x SI.
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