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| The present study was conducted to evaluate the impacts of dietary supplementation of chromium yeast alone and in combination with antioxidants on growth, feed conversion and nitrogen retention in broilers during winter season. A total of 180, Cob-400 straight run broiler chicks at one day-old, were randomly distributed into four equal groups replicated three times with 15 birds per replicate. The treatments consisted of 4 experimental groups as follows: T0, T1, T2 and T3. Chicks were fed corn-soya based broiler mash (basal diet) maintained as control (T0), the basal diet supplemented with chromium (Cr)at 0.5 mg Cr/kg diet from chromium yeast (T1), the basal diet + 0.5 mg Cr /kg diet from chromium yeast + 250 mg of ascorbic acid /kg of diet (T2), and the basal diet + 0.5 mg Cr /kg diet from chromium yeast + 250 mg vitamin E /kg of diet (T3). Body weight and feed consumption were recorded to evaluate the growth performance and feed conversion ratio (FCR). Nitrogen retention was observed by conducting metabolic trial during 6th week. The climatic data revealed that there were huge variations in house air temperatures within a day. In house relative humidity ranged from 29.01% to 44.21% during the experimental period. The average weight gains were numerically higher and FCR values were lower in supplemented groups particularly in T2 group than T0 group. The significantly higher (p< 0.05) nitrogen retention values were recorded in T2 group followed by T1than T0 group. It was concluded that Cr in combination with ascorbic acid yielded better results in terms of performance in broilers, thus suggesting some synergetic action of both Cr and ascorbic acid that need to investigate further with specially designed projects.

Effect of Dietary Supplementation of Chromium Yeast Alone and in Combination with Antioxidants on Performance of Broilers