Previous research has shown that feeding high amino acid density (AAD) diets or increased AME improved broiler performance, though the relationship between AAD and AME on performance needs to be further explored. Therefore, the objective of this study was to evaluate the impact of feeding 2 AAD and 4 AME levels from day 0 to 14 on performance and yield of 42-day-old Cobb MV × Cobb 500 males. Starter diets were formulated to medium or high AAD (HAA), and very low (VLE), low (LE), medium (ME), or high (HE) AME. Common diets were provided from day 15 to 41. A 2 × 4 factorial arrangement of treatments was used, with day 0 BW considered as a covariant. On day 0 to 14, birds receiving HAA had the lowest feed conversion ratio (FCR) corrected and uncorrected for mortality (uFCR). Birds receiving VLE diets had the highest day 0 to 14 FCR when compared to birds fed other AME levels. Feeding LE diets resulted in higher day 0 to 14 FCR when compared to ME and HE diets. An AAD × AME interaction for day 0 to 14 total Lys intake/bird found that Lys intake/bird decreased when increasing dietary AME for HAA diets. An AAD × AME interaction was observed for day 0 to 28 uFCR whereas increasing starter AAD in diets formulated to ME and HE increased day 0 to 28 uFCR; no change was observed for VLE and LE diets. However, overall performance and processing was not affected by varying starter AAD and AME levels. Further research should investigate similar feeding strategies, but in other feeding phases.

先前的研究表明，饲喂高氨基酸密度（AAD）的饲料或增加AME可以改善肉鸡的生产性能，尽管AAD和AME之间的关系还需要进一步研究。因此，本研究的目的是评估从第0天到第14天饲喂2种AAD和4种AME水平对42天大的Cobb MV×Cobb 500雄性仔鸡的性能和产量的影响。初学者饮食的配方分为中等或高AAD（HAA），极低（VLE），低（LE），中（ME）或高（HE））AME。从第15天到第41天提供普通饮食。采用2×4因子处理安排，第0天体重作为协变。在第0天到第14天，接受HAA的家禽经校正和未经校正的最低饲料转化率（FCR）（uFCR）。与饲喂其他AME水平的鸟类相比，接受VLE饮食的鸟类的0-14天FCR最高。与ME和HE饮食相比，LE饮食喂养的第0至14天FCR较高。第0天到第14天总Lys摄入量/鸟的AAD×AME相互作用发现，当增加HAA饮食的膳食AME时，Lys摄入量/鸟的数量减少。在第0至28 uFCR天观察到AAD×AME相互作用，而在以ME和HE配制的日粮中增加起始AAD则在第0至28 uFCR天观察到。VLE和LE饮食未见变化。但是，启动器AAD和AME级别的变化不会影响整体性能和处理。进一步的研究应调查类似的喂养策略，但在其他喂养阶段。