Pos-embrionary development of Lucilia cuprina reared on horse meat, previously exposed at 27°C for different periods (two, 24, 48, 72 and 96 hours) was studied. Sixty grams of diet and 2 g diet per 1 larva ratio were used. There were four replication in each treatment. The results of this experiment indicated that the development time of the larval and pupal stages were shorttened when L. cuprina was reared on this substrate previously exposed to 2 and 24 hours. However, the body weigth was lower than that observed. The emergence of adults were higher than 50% in each treatment