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

ABSTRACT This experiment was conducted to investigate the effects of leucine (Leu) supplementation on performance and carcass traits of broilers along with the re-evaluation of standardized ileal digestible (SID) Leu requirement of broiler chicks on days 0-14. Birds were fed seven experimental diets with SID Leu levels of 16.3 (basal), 17.3, 18.3, 19.3, 20.3, 21.3, and 22.3 g/kg. Some 280 male broiler chicks were randomly assigned to the seven dietary treatments in a completely randomized design with five replicates. Dietary SID Leu levels had significant effects on body weight gain(BWG), feed conversion ratio(FCR), carcass, and breast percentages. BWG increased (p

摘要：本实验旨在探讨赖氨酸（Leu）补充对肉鸡性能及胴体特征的影响，并重新评估了0-14日龄肉鸡标准回肠可消化赖氨酸（SID Leu）的需求量。实验中，鸡只被喂食七种实验性饲料，其SID赖氨酸水平分别为16.3克/千克（基础水平）、17.3克/千克、18.3克/千克、19.3克/千克、20.3克/千克、21.3克/千克和22.3克/千克。约280只雄性肉鸡被随机分配至七种饲料处理组，采用完全随机设计，每组设有五个重复。饲料中的SID赖氨酸水平对体重增加（BWG）、饲料转化率（FCR）、胴体和胸肉百分比产生了显著影响。体重增加呈显著增加趋势（p