标准回肠消化率在肉鸡饲料原料氨基酸营养价值评定中的应用

为了获得最佳生产性能，配制满足家禽营养需要的日粮配方和将排泄到环境中的过多养分降到最低，已显得尤为重要。关于蛋白质饲料原料，多通过表观回肠消化率反映其利用率。以表观回肠消化率值为基础配制日粮，低估了饲料原料的氨基酸消化率，导致排泄物中养分含量增加。通过内源氨基酸基础损失校正表观回肠消化率所得的标准回肠消化率，能克服表观回肠消化率的局限性。作者讨论了标准回肠氨基酸消化率和内源氨基酸基础损失的估测方法，并对其在肉鸡饲料原料氨基酸营养价值评定中的应用作一总结。

Application of Standardized Ileal Digestibility in Amino Acid Nutrient Evaluation of Feed Ingredients in Broilers

For optimal performance,it is important to formulate diets that meet the nutrient requirements for poultry while minimizing the excretion of excess nutrients into the environment.With respect to protein feed ingredients,apparent ileal digestibility is widely used to reflect its bioavailability.If diet formulations are based on apparent ileal digestibility values,the digestibility of amino acid in feedstuffs will be underestimated and may result in an increased level of nutrient excretion.The concept of standardized digestibility system in which corrections are made for basal endogenous amino acid losses as a mean of overcoming the limitations of apparent digestibility estimates is proposed.Standardized ileal amino acid digestibility and the method of evaluating basal endogenous amino acid losses are discussed.The application of standardized ileal amino acid digestibility in amino acid nutrient evaluation of feed ingredients in broilers are reviewed in this article.