Limiting Nitrogenous Factors in Corn Protein for Adult Female Swine

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Abstract
Littermate Yorkshire gilts, 10 months of age and weighing 135 kg, were employed in two long-term nitrogen balance assays to determine the limiting nitrogenous factors in corn protein for adult gravid (70th day post-coitum) and nongravid swine. Amino acid additions were designed to bring the concentration of the individual amino acids (or nitrogen in the case of nonspecific nitrogen addition) to the level present in a 12%-protein corn-soybean meal reference diet. Supplementation of the fortified corn diet with 0.25% L-lysine·HC1 increased nitrogen retention in both nongravid and gravid gilts. A further addition of 0.041% L-tryptophan also increased nitrogen retention in both non-gravid and gravid gilts. Addition of nonspecific amino nitrogen (L-glutamic acid and glycine) to the lysine and tryptophan-supplemented diet increased retention of dietary nitrogen by nongravid but not gravid gilts. The data suggest that the first- and second-limiting amino acids in corn protein for young adult female swine, both gravid and non-gravid, are lysine and tryptophan, respectively.

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