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Lysine Imbalance of Corn Protein in the Growing Pig

University of Illinois, Urbana

Abstract

Three trials were conducted with 198 growing pigs to evaluate amino acid additions to a fortified corn diet. Lysine supplementation at 0.2% of the diet caused a marked depression in voluntary feed intake and rate of gain. The same level of supplemental methionine was without effect. Supplemental DL-tryptophan at 0.05% of the diet completely overcame the depression caused by lysine. The data suggest that tryptophan is the first-limiting and lysine the second-limiting amino acid in corn protein and that methionine is not third-limiting.

Pigs fed corn diets on pasture performed better than those fed in drylot, particularly when supplemental tryptophan was not provided.

This article has been cited by other articles:

				A. C. Guzik, L. L. Southern, T. D. Bidner, and B. J. Kerr The tryptophan requirement of nursery pigs J Anim Sci, October 1, 2002; 80(10): 2646 - 2655. [Abstract] [Full Text] [PDF]