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Effect of Lysine, Methionine and Tryptophan Supplementation upon Nitrogen Retention of Barrows¹

New Jersey Agricultural Experiment Station, New Brunswick

Abstract

Four nitrogen balance trials were conducted to investigate the effect of supplementing corn-soybean meal diets with lysine, methionine and tryptophan for barrows weighing from 50 to 90 kg. The addition of 0.08% lysine to a 12% protein basal ration failed to increase nitrogen retention, while the addition of 0.08% lysine to the basal ration diluted with sucrose to reduce the protein to 7.5 or 9.7% produced a significant (P<.05) increase in nitrogen retention. Methionine additions to the basal diet reduced to 8.3% protein by sucrose addition produced no increase in nitrogen retention. Addition of tryptophan (0.06%) in the presence of supplemental lysine (0.24%) produced a significant (P<.01) increase in nitrogen retention. Addition of 0.6% tryptophan alone, or methionine (0.15%) in the presence of supplemental lysine and tryptophan, was without effect.

¹ Paper of the Journal Series, New Jersey Agricultural Experiment Station, Rutgers—the State University, New Brunswick, New Jersey.

² Department of Animal Sciences.