Previous research in our laboratory has revealed that feeding crumbled diets with various levels of starter digestible Lys (dLys) and AME affects early feed conversion ratio (FCR) of Cobb MV × Cobb 500 broilers. However, overall performance was not affected, likely due to treatment application occurring in the starter phase. Therefore, the objective of this study was to evaluate a 3 dLys (1.00, 1.08, and 1.18%) × 4 AME (2,937, 3,028, 3,116, and 3,206 kcal/kg) factorial arrangement of pelleted grower diet treatments (Gdiets) and their impact on 42-day-old Cobb MV × Cobb 500 females. Significant dLys × AME interactions demonstrated a stepwise decrease in FCR (day 14–28 and 14–35) when dLys increased at 2,937, 3,116, and 3,206 kcal/kg but not at 3,028 kcal/kg AME. A significant dLys × AME interaction was also observed for day 14–28 total Lys intake/bird. Overall data exhibited improvements in BW and BW gain (BWG) when feeding Gdiets of 1.08 or 1.18% dLys. Feeding Gdiets of 1.18% dLys or ≥3,028 kcal/kg AME optimized day 14–41 FCR. Processing data demonstrated improved breast yield when feeding Gdiets formulated to ≥1.08% dLys or formulated to 2,937 or 3,028 kcal/kg AME. The most profitable Gdiet was 1.18% dLys +3,028 kcal/kg AME. To determine the best feeding regime for this new cross, future research should evaluate the effects of varying dLys and AME levels during the finisher phase on broiler performance.

我们实验室先前的研究表明，饲喂各种水平的起子可消化的Lys（dLys）和AME破碎的日粮会影响Cobb MV×Cobb 500肉鸡的早期饲料转化率（FCR）。但是，总体性能没有受到影响，这很可能是由于在启动阶段发生了处理应用。因此，本研究的目的是评估颗粒状生长日粮处理的3 dLys（1.00、1.08和1.18％）×4 AME（2,937、3,028、3,116和3,206 kcal / kg）的因子安排（Gdiets）及其对42天大的Cobb MV×Cobb 500女性的影响。当dLys以2,937、3,116和3,206 kcal / kg AME升高但没有以3,028 kcal / kg AME升高时，显着的dLys×AME相互作用表明FCR逐步降低（第14–28天和14–35天）。在第14-28天的总Lys摄入量/家禽中还观察到了显着的dLys×AME相互作用。总体数据显示BW和BW增益（BWG）饲喂1.08 dLys或1.18％dLys的Gdiets。在第14-41天FCR时，优化1.1％dLys或≥3,028 kcal / kg AME的喂养饮食。加工数据表明，当饲喂配制成≥1.08％dLys或配制成2,937或3,028 kcal / kg AME的Gdiets时，乳房产量得到改善。最赚钱的Gdiet是1.18％dLys +3,028 kcal / kg AME。为了确定这种新杂交的最佳饲喂方案，未来的研究应评估育肥阶段不同dLys和AME水平对肉鸡生产性能的影响。