Effect of selenium and sodium bicarbonate supplementation diets on blood biochemical properties, growth performance and carcass traits of broilers in heat stress condition

This experiment was conducted using 216 male chicken (Ross 308) to evaluate the effects of organic selenium and sodium bicarbonate supplementation on blood parameters، growth performance and carcass characteristics in heat stress condition. Birds were reared under same condition and fed with similar diets till 28 d of age. At 28 days of old، broiler with similar weight were regrouped within dietary treatments and fed finisher diets for the following 14 d. The temperature was increased to 35 °C for 7 h/d. The experiment was conducted using a randomized complete block design with the 2×3 factorial method. Experimental diets were prepared by adding 0 or 0. 3 mg/kg of organic selenium (factor 1) and/or 0، 3 and 6 g/kg sodium bicarbonate (factor 2) to the control diet. Results showed that selenium affect (P<0. 05) glutathione peroxidase، superoxide dismutase enzymes concentrations and total antioxidant capacity. Supplementation selenium or sodium bicarbonate reduced triglyceride and increased total protein of blood (P<0. 05). Sodium bicarbonate reduced feed conversion rate (P<0. 05)، however selenium has no effect on feed conversion ration. Supplementation diets with sodium bicarbonate significantly (P<0. 05) increased growth performance، breast and thigh weight. Selenium significantly (P<0. 05) decrease the abdominal fat and liver weight percent. It can be concluded that supplementation the broiler chicken diets with Se and sodium bicarbonate may have some beneficial effects، under heat stress condition.