The Heat Shock Proteins (HSP) is a group of proteins that play a key role in cell protection against the effects of thermal stress. The present work investigated the effect of thermal stress on the expression of HSP70, HSP90 and on the physiological parameters: rectal temperature (RT), heart rate (HR) and respiration rate (RR) in young bulls of the Dairy Gyr breed in Brazil. The animals were taken to the cattle shed in two periods: a) early in the morning and b) -after submitted to the sun during two hours (from 11:00 to 13: 00hs). Following identification, RT, HR and RR were recorded and blood samples for HSP analyzes collected, by period (before and after exposure to the sun). For analysis of the expression of HSPs, the genetic material was extracted from leukocyte. Statistical analyzes were performed using the SPSS program, version 16.0. The air temperature was higher in the afternoon (25 x 40 p
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