Abstract
The nutritional value or quality of dietary proteins used for poultry feed formulation varies: amino acid availability is an important measure of protein quality. Determination of ileal digestibility values has become the preferred method for estimating amino acid availability. This review discusses the different approaches to the expression of digestibility results, including correction for endogenous loss and the derivatisation of standardised values. Sources of variation in values include, the assay protocol, anti-nutritional factors in feedstuffs and feed milling. Feed formulating with ileal digestibility values should allow higher dietary inclusion levels of protein feedstuffs of lower quality provided that values of different feedstuffs are additive, the age of the bird and the use of feed enzymes are considered. An Australian data set of "ileal digestible amino acid values in feedstuffs for poultry" that has recently be published is described. This overview is intended to stimulate interest in the generation and application of ileal digestibility as a method for estimating amino acid availability in poultry nutrition.
Highlights
Knowledge of the availability of amino acids in feedstuffs is an important feature of dietary protein quality
Differences observed between ileal and excreta digestibilities in these studies clearly demonstrated that amino acid metabolism by hindgut microflora in chickens may be substantial and that digestibilities determined at the terminal ileum are a more accurate reflection of amino acid availability than those determined in excreta
Databases on standardised ileal digestibility values of amino acids in feed ingredients are available, wherein published apparent digestibility values have been transformed to standardised values using existing literature data on endogenous amino acid recovery in ileal digesta (Lemme et al, 2004)
Summary
Amino acid digestibility and poultry feed formulation: expression, limitations and application. An Australian data set of “ileal digestible amino acid values in feedstuffs for poultry” that has recently be published is described. This overview is intended to stimulate interest in the generation and application of ileal digestibility as a method for estimating amino acid availability in poultry nutrition. Digestibilidade de aminoácidos e formulação de rações para aves: expressão, limitações e aplicações. A determinação dos valores de digestibilidade ileal tornou-se o método preferido para a estimativa da disponibilidade de aminoácidos. A formulação de rações com base nos valores de digestibilidade ileal deve permitir a inclusão de maiores níveis dietéticos de alimentos com proteína de qualidade inferior, desde que sejam considerados os valores dos diferentes alimentos aditivos, a idade da ave e o uso de enzimas para alimentação animal. Palvras-chave: alimentos, aminoácidos, digestibilidade aparente, galinhas, íleo, perda endógena
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