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首页> 外文期刊>Tropical Animal Health and Production >Effect of dietary lysine to crude protein ratio on performance of male Ross 308 broiler chickens
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Effect of dietary lysine to crude protein ratio on performance of male Ross 308 broiler chickens

机译：日粮赖氨酸/粗蛋白比例对雄性Ross 308肉鸡生产性能的影响

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摘要

Two experiments were conducted to determine the effect of dietary lysine to crude protein ratio on performance of male Ross 308 broiler chickens. In each experiment the diets were isocaloric and isonitrogenous but with different lysine to crude protein ratios. A complete randomized design was used in both experiments, the starter (1–21 days) and grower (22–42 days) experiments. The three starter diets, based on lysine to crude protein ratios, were L0 (0.055), L1 (0.066) and L2 (0.077), while grower diets were L3(0.047), L4(0.061) and L5(0.074). A quadratic type equation was used to determine ratios for optimum growth rate, feed conversion ratio, breast meat yield and breast meat nitrogen content. Dietary lysine to crude protein ratios of 0.066 and 0.077 supported optimum growth rate and feed conversion ratio, respectively, during the starter period. Dietary lysine to crude protein ratios of 0.073, 0.073, 0.069 and 0.079 supported optimum growth rate, feed conversion and breast meat yield and nitrogen content during the grower phase. Dietary lysine to crude protein ratio had no effect on diet intake and digestibility. The results indicate that at each phase a single dietary lysine to crude protein optimized both growth rate and feed conversion ratio. However, the ratio for optimum breast meat yield was lower than that for optimum growth rate and feed conversion ratio. These findings have implications on ration formulation for broiler chickens.
机译：进行了两个实验，以确定日粮赖氨酸与粗蛋白之比对雄性Ross 308肉鸡性能的影响。在每个实验中，饮食都是等热量和等氮的，但是赖氨酸与粗蛋白的比例不同。在起始实验（1-221天）和生长实验（22-42天）这两个实验中均使用了完整的随机设计。根据赖氨酸与粗蛋白的比率，三种起始饮食为L 0 （0.055），L 1 （0.066）和L 2 （ 0.077），而日粮中的L 3 （0.047），L 4 （0.061）和L 5 （0.074）。使用二次方程式来确定最佳生长率，饲料转化率，胸肉产量和胸肉氮含量的比率。日粮中赖氨酸与粗蛋白之比为0.066和0.077，分别在起始阶段可支持最佳生长速率和饲料转化率。日粮赖氨酸与粗蛋白之比为0.073、0.073、0.069和0.079，可在生长阶段支持最佳生长速率，饲料转化率以及胸肉产量和氮含量。饮食中赖氨酸与粗蛋白的比例对饮食摄入和消化率没有影响。结果表明，在每个阶段，从赖氨酸到粗蛋白的单一饮食都能优化生长速度和饲料转化率。然而，最佳胸肉产量的比率低于最佳生长率和饲料转化率的比率。这些发现对肉鸡的日粮配方有影响。

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