Response of Broiler Chicks to Dietary L-Leucine Supplementation in the Starter Period

This experiment was conducted to investigate the effects of leucine (Leu) supplementation on performance and carcass traits broilers along with re-evaluation standardized ileal digestible (SID) Leu requirement broiler chicks days 0-14. Birds were fed seven experimental diets SID levels 16.3 (basal), 17.3, 18.3, 19.3, 20.3, 21.3, 22.3 g/kg. Some 280 male randomly assigned dietary treatments in a completely randomized design five replicates. Dietary had significant body weight gain(BWG), feed conversion ratio(FCR), carcass, breast percentages. BWG increased (p<0.05) when 18.3 21.3 g/kg compared basal diet. FCR decreased by comparison Carcass yield 19.3 Breast percentage (p<0.01) received highest value obtained level Abdominal fat linearly (p<0.01). Regression analysis indicated 18.67, 18.88, 19.85 for BWG, FCR, meat yield, respectively. It can be concluded that characteristics, especially improve supplementation. Based results, modern has dramatically due genetic selection higher growth rate.