The inclusion of L-Val and L-Ile is progressively becoming an economically feasible strategy to reduce the dietary CP content of broiler diets. In the current experiment, the influence of supplementing the feed-grade branched chain amino acids (BCAA) Val and Ile was evaluated in corn and soybean meal–based (CSBM) diets, with or without the inclusion of either peanut meal (PM) or an animal protein blend (APB), on broiler growth performance (0–48 D), processing characteristics, and incidence of pododermatitis and litter characteristics. Supplementation of BCAA reduced analyzed CP by an average of 1.62 percentage units across 4 feeding phases. Overall (0–48 D), broiler body weight gain and FCR were unaffected when fed supplemental BCAA; however, feed intake was increased for those supplemented with BCAA. Overall growth performance was similar when including either PM or APB in CSBM diets. At processing, broilers fed BCAA diets had increased relative and absolute breast fillets and total white meat weights, as well as heavier fat pad weights. Nitrogen excretion was reduced when BCAA were supplemented, but no differences were observed for footpad dermatitis (FPD) lesion scores. Interestingly, APB supplementation did not impact litter moisture or nitrogen but improved FPD scores compared to birds fed CSBM, with PM-fed birds having intermediate FPD scores. In conclusion, these data indicate that BCAA inclusion can support CP reductions while maintaining growth performance, improving breast fillet yield, and reducing nitrogen excretion in broilers reared to market ages.

包含L-Val和L-Ile逐渐成为降低肉鸡日粮CP含量的经济可行策略。在当前的实验中，评估了添加玉米或豆粕（CSBM）日粮中是否添加了饲料级支链氨基酸（BCAA）Val和Ile的影响，无论是否添加花生粉（PM）或动物蛋白混合物（APB），关于肉鸡的生长性能（0–48 D），加工特性以及足部皮炎和垫料特性的发生率。补充BCAA可在4个饲喂阶段将分析的CP平均降低1.62个百分点。总体而言（0-48 D），饲喂补充BCAA时，肉鸡体重增加和FCR不受影响。但是，补充了BCAA的人的采食量增加了。在CSBM日粮中添加PM或APB时，总体生长表现相似。在加工过程中，饲喂BCAA日粮的肉鸡的相对和绝对胸脯肉和白肉总重量增加，脂肪垫重量增加。补充BCAA可以减少氮的排泄，但是脚垫皮炎（FPD）未见差异）病变分数。有趣的是，与饲喂CSBM的家禽相比，补充APB不会影响垫料水分或氮，但改善了FPD分数，而PM饲喂的家禽的FPD分数中等。总之，这些数据表明，BCAA的加入可以支持CP的降低，同时保持生长性能，提高胸脯肉的产量，并减少饲养到上市年龄的肉鸡的氮排泄。