One hundred fifty one day old unsexed chicks of Hubbard breeds were used to study the effect of pant oil supplememt and fasting on productive characteristic of birds reared under high ambient temperature . During the period at 1-21 day-old the birds were housed in one room. In the fourth weeks of the experiment, the chicks were assigned to one of five treatments: - T1 had no supplementary oil, - T2 had 3% supplementary oil, - T3 had ration with 3% oil and was offered intermittently for 6 hours (10-16 H). During the day, birds were fed in diet without oil. - T4 and T5 were fasting treatments (10-16 H), but T4 had no supplementary oil, and T5 had supplementary 3% oil. Results indicates that birds of T2 and T5 were significantly (P<0.05) higher than those of T1, T3 and T4 in body weight in 5 and 7 weeks, and in weight again at 3-7 weeks of age. Dressing percentage increased significantly (P<0.05) in birds of T2 as compared to those of T1. Results revealed that fasting could be a better tool than dietary oil supplement in reducing the negative effects of elevated temperatures on % mortality rate. The results also confirmed that the supplementation of oil in broiler diets has positively effected feed efficiency, net meat percentage of carcass, fat and dry matter percentage of net meat.

Key Words :Plant Oil Supplememt, Fasting, Broilers, Temperature