The effect of increased ambient temperature on ADFI in growing pigs has been extensively described. In a review, Le Dividich et al. (1998) reported that the associated reduction of ADFI ranged from a minimum of 40 gd−1°C−1 to a maximum of 80 gd−1°C−1. According to these authors, this large variability can be explained bymany factors including breed, BWrange, diet composition, and to the greatest extent, temperature range. From our results, each degree increase in ambient temperature from 24 to 31°C resulted in a reduction of ADFI equivalent to about 8 gd−1kg−0.60 in LW pigs
when both experiments were considered. This value is similar to the value estimated from the equation proposed by Quiniou et al. (2000; 7 gd−1
kg−0.60
)