Pack M, Schutte J B
Degussa AG, Applied Technology Feed Additives, Hanau, Germany.
Poult Sci. 1995 Mar;74(3):488-93. doi: 10.3382/ps.0740488.
A calculation model was developed that can be used to derive dietary methionine and cystine (TSAA) levels for maximum profitability in growing broilers. Based on dose-response curves from two broiler experiments, the model calculates additional income from improved feed conversion and from increased breast meat yield. From the comparison of additional income to the additional cost associated with increasing dietary TSAA levels, the TSAA content giving maximum profit can be estimated. Under European price conditions, a dietary level of .95% TSAA was found to be most profitable for broilers grown to 1.7 kg (Experiment 1, 14 to 34 d of age), when only the feed conversion response to dietary TSAA was considered. In broilers grown to 2.2 kg (Experiment 2, 14 to 38 d of age), two situations were simulated. If only the feed conversion response was evaluated, the most profitable TSAA level would be .85%. If both feed conversion and breast meat responses were considered, a higher level of .89% TSAA would be optimum. Changing prices of input and output variables (broiler feed, breast meat, DL-methionine) affected the respective economic optimum level of dietary TSAA only slightly.
开发了一种计算模型，可用于推导能使生长肉鸡实现最大盈利的日粮蛋氨酸和胱氨酸（总含硫氨基酸）水平。基于两项肉鸡试验的剂量反应曲线，该模型计算出因饲料转化率提高和胸肉产量增加而带来的额外收益。通过将额外收益与因提高日粮总含硫氨基酸水平而产生的额外成本进行比较，可估算出能带来最大利润的总含硫氨基酸含量。在欧洲价格条件下，当仅考虑饲料转化率对日粮总含硫氨基酸的反应时，发现日粮总含硫氨基酸水平为0.95%对生长至1.7千克的肉鸡（试验1，14至34日龄）最有利可图。在生长至2.2千克的肉鸡（试验2，14至38日龄）中，模拟了两种情况。如果仅评估饲料转化率反应，最有利可图的总含硫氨基酸水平将为0.85%。如果同时考虑饲料转化率和胸肉反应，总含硫氨基酸的最佳水平将为0.89%。投入和产出变量（肉鸡饲料、胸肉、DL-蛋氨酸）价格的变化对日粮总含硫氨基酸各自的经济最佳水平影响甚微。
