Formulating pig diets to closely match the supply of AAs with the AA requirements of the animals presents a significant economic benefit and helps minimize nitrogen excretion in pig manure, thus reducing the environmental impact of livestock production on the environment. To achieve this goal, knowledge of the bioavailability of AAs in pig feed ingredients is required. Due to the difficulties involved in determining the content of bioavailable AAs in feedstuffs on a routine basis, ileal digestible AAs are used. To this end, it is recommended to use standardized ileal digestible AA coefficients as estimates of bioavail-able AA. Such values should be determined for the specific feeding situation. Continued efforts to develop and/or refine current methods for determining bioavail-ability of AAs for routine application are warranted.

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