The use of nutritional requirements adjusted to the new broiler genotypes defines their optimal genetic expression. Thus, broiler breeders, universities, and scientific institutions have carried out research with different nutritional requirements to improve the productive efficiency of broilers and decrease production costs. This test aimed to evaluate the growth performance and carcass characteristics of 1,200 unsexed Ross 308 broiler fed diets formulated by the requirements of Ross 308, NRC, FEDNA, and Rostagno for a period of 35 d. Throughout the experimental period, the Ross 308 group improved (P < 0.05) the BW and feed intake compared with the other experimental requirements. In addition, the NRC group decreased the BW and feed intake, although with similar results with the FEDNA and Rostagno groups, respectively (P < 0.05); this last treatment decreased the feed conversion ratio and viability (P < 0.05). Furthermore, the Ross 308 and FEDNA groups showed the highest carcass yield (P < 0.05); and the lowest breast yield (P < 0.05) was found in the NRC group. However, the leg and abdominal fat yields did not differ among treatments (P > 0.05). Moreover, diets under FEDNA reported the highest relative weights for the liver, heart, and gizzard. Likewise, this group (FEDNA) reduced breast protein and ashes, as well as the NRC group increased crude fat and decreased the a∗. The diets formulated based on digestible amino acids and with a good balance of protein and energy, such as those of the Ross 308 group, showed the higher results.

根据新的肉鸡基因型调整的营养需求决定了它们的最佳基因表达。因此，肉鸡育种者，大学和科研机构进行了具有不同营养需求的研究，以提高肉鸡的生产效率并降低生产成本。该测试旨在评估按罗斯308，NRC，FEDNA和Rostagno的要求配制的1,200种不性别的罗斯308肉鸡饲喂日粮的生长性能和car体特性，持续35天。在整个实验期间，罗斯308组的成绩得到了改善（P <0.05）体重和采食量与其他实验要求相比。此外，NRC组降低了体重和采食量，尽管FEDNA组和Rostagno组的结果相似（P  <0.05）。最后的处理降低了饲料的转化率和生存能力（P  <0.05）。此外，Ross 308和FEDNA组的car体产量最高（P  <0.05）。 NRC组的乳房产量最低（P <0.05）。然而，腿部和腹部脂肪的产量在不同的治疗方法之间没有差异（P> 0.05）。此外，FEDNA饮食中肝脏，心脏和for的相对体重最高。同样，该组（FEDNA）减少了乳蛋白和骨灰，而NRC组增加了粗脂肪并降低了a＊。基于可消化氨基酸并具有良好蛋白质和能量平衡的日粮（例如Ross 308组）显示出更高的结果。