One hundred and twenty broilers (one-day old) were divided into 1 control and 3 experimental groups consisting 30 animals each. The experimental groups were as follow; Group I (control) was fed with basal diet, Group II was fed with high energy diet (3250 kcal/ kg as starter diet; 3300 kcal/kg as grower diet), Group III was fed with high energy diet supplemented with 1mg/kg Se as sodium selenite, Group IV was fed with high energy diet supplemented with 250 mg /kg Vit C as ascorbic acid. Plasma triiodothyronine and triglyceride levels were found significantly increased in group II compared to those of groups supplemented selenium and vitamin C. Malondialdehyde level was higher in liver (P<0.01) and abdominal fat (P<0.05) in control and group II in compared to those in other groups. The catalase (CAT) activity of liver was observed the highest in control and group II in compared to those in other groups. The CAT activity of abdominal fat was seen significantly higher in control than group III. Reduced glutathione activities for liver, abdomial fat and heart were not significantly different among all the groups. Results showed that cold exposure and diets of high energy induced oxidative damage in tissues, but this damage decreased partly with selenium and vitamin C supplementing to diet.