Bound protein in feedstuffs and pure forms of crystalline AA supply AAs in pig diets. Crystalline AAs are assumed to be completely absorbed from the gut and utilized by the animal. In contrast, animals are only able to utilize a portion of the AAs contained in bound protein for metabolic functions. Therefore, the total amount of AAs in a diet is not equal to the amount of AAs that are available to the animal for metabolic functions. As a consequence, estimates of bioavailability of dietary AAs are used in formulating swine diets to match the supply with requirements.
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