This study was performed in a commercial farm with 5500 sows, located at Mato Grosso State in the Midwest region of Brazil (Parallel 14°) from March to April. This region has a tropical climate, whose average ambient temperatures varied from 21 to 27 °C. The average minimum and maximum temperatures ranged from 16 °C to 23 °C and from 24 °C to 36 °C, respectively. The room temperature was controlled based on the curtain management that consists on subjective criteria for carrying up or lowering according to the sensitivity of the employee in accordance with aspects such as light, wind chill and wind speed.