肉鸡日粮最优的含硫氨基酸与赖氨酸比例.pptxVIP

肉鸡日粮最优的含硫氨基酸与赖氨酸比例第1页/共39页 Determination of optimal amino acid ratios理想蛋白氨基酸比例的测定Ideal Protein Concept理想蛋白的概念Ideal ratios between amino acids (reference Lys)氨基酸的理想比例（以赖氨酸为标准）Should be applied on basis of digestible amino acids应当以可消化氨基酸为基础应用Determination of ideal amino acid ratios理想蛋白氨基酸比例的测定Factorial approach 析因法Dose-response trials 剂量反应试验第2页/共39页 Factorial approach析因法Partitioning of amino acid requirement for various purposes – factors把氨基酸需要量分割为用于各种目的需要量－因子What‘s required? 需要什么？Amino acid retention (net accretion)氨基酸的存留（净增加）Analysed content of weight gain, egg mass, feathers, milk yield, etc.分析增重、蛋内容物、羽毛、产奶等的成分Utilisation of absorbed amino acids吸收氨基酸的利用率Dependent on amino acid balance依赖于氨基酸的平衡Maintenance requirement维持需要Amino acid requirement for zero gain零增重时的氨基酸需要Function of body weight体重的功能第3页/共39页 Partition of the lysine requirement赖氨酸需要量的分割第4页/共39页 Partition of the methionine+cysteine requirement蛋+胱需要量的分割第5页/共39页 Not 100% of the AA absorbed by the small intestine are used for retention吸收的氨基并不能100％利用Lysine utilisation = 80%赖氨酸利用率＝80％Isoleucine utilisation = 61%异亮氨酸利用率＝61％第6页/共39页 Lysine accr. (slow)= -22.49 +0.76x r2 = 98%Lysine accr. (fast) = -25.63 +0.79x r2 = 99%Methionine accr. = -3.4 +0.68x r2 = 97%TSAA accr. = -2.74 +0.52x r2 = 97%Threonine accr. = -13.75 +0.82x r2 = 99%Valine accr. = -13.44 +0.73x r2 = 99%x = AA intake氨基酸的食入量H.M. Edwards et. al, Poultry Science,1999Edwards and Baker, Poutry Science, 1999Edwards and Baker, Br.J.Nutr, 1997D.H. Baker et al., J.Nutr., 1996Intermediate utilisation of AA氨基酸的平均利用率第7页/共39页 Three sections of an exponential dose-response curve指数剂量反应曲线的三个阶段Amino acid retention, 氨基酸存留，g/dy = a + b * (1- e -( c * X)a + b aI II III I = slope is almost linear斜率几乎是线性 II = slope is non linear斜率是非线性 III = slope tends against zero 斜率趋于零Utilisation of the digested AA is highest in section I在第一阶段，消化的氨基酸利用率最高可消化氨基酸的食入量，g/d第8页/共39页 Utilisation of dietary Met in low (18.3%) and high (22.9%) CP diets f