This study was conducted to establish the optimal digestible arginine (dArg) to digestible lysine (dLys) ratio of Yield Plus Male × Ross 708 male broilers from 1 to 14 d of age, 1 to 25 d of age (experiment 1), and 25 to 42 d of age (experiment 2) based on growth performance, feed utilization, and processing yields. Diets were comprised of corn, wheat middlings, corn gluten meal, poultry meal, and soybean meal, and formulated to be surfeit in limiting amino acids except dArg. For both experiments, dietary treatments were arranged in a randomized complete block design. Optimum values calculated were obtained from quadratic broken line methodology. In experiment 1, the dArg/dLys ratio for optimizing BW gain and feed conversion ratio (FCR) was determined to be 106 for both variables from 1 to 14 d of age, and 105 and 108 from 1 to 25 d of age, respectively. In experiment 2, the optimum dArg/dLys value was estimated to be 129 and 116 for BW gain and FCR, respectively, during the 25 to 42 d period. Optimum dArg/dLys values for carcass yield, breast weight, and breast yield were estimated to be 136, 112, and 109, respectively. Absolute and relative weights of thighs increased linearly (P < 0.001) with progressive increases in dArg/dLys. The results of this study suggest that the optimum dArg/dLys necessary to maximize performance increases as the bird ages.

这项研究的目的是确定1-14岁，1-25岁（实验1）和25岁的Yield Plus Male×Ross 708雄性肉鸡的最佳可消化精氨酸（dArg）与可消化赖氨酸（dLys）的比率。 -根据生长性能，饲料利用率和加工产量确定的最大年龄为42 d（实验2）。日粮由玉米，小麦中粉，玉米面筋粉，家禽粉和大豆粉组成，并配制成除dArg以外的有限氨基酸。对于这两个实验，饮食治疗均以随机完整区组设计进行安排。计算的最佳值是从二次折线方法获得的。在实验1中，dArg / dLys比用于优化BW增益和饲料转化率（FCR）分别针对年龄从1到14 d的两个变量确定为106，从年龄1到25 d的105和108分别确定为。在实验2中，在25到42 d期间，BW增益和FCR的最佳dArg / dLys值分别估计为129和116。car体产量，乳房重量和乳房产量的最佳dArg / dLys值分别估计为136、112和109。大腿的绝对重量和相对重量随着dArg / dLys的逐渐增加而线性增加（P <0.001）。这项研究的结果表明，随着家禽年龄的增长，最大化性能所必需的最佳dArg / dLys会增加。