Some Effects of Adding Supplements of Lysine, Methionine and Tryptophan to Practical Swine Rations

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Abstract
Three trials were conducted with pigs from weaning to about 100 lb. to determine the effect of supplementing practical rations of corn, soybean meal, tankage and wheat shorts containing 14, 16 and 18 percent protein with lysine, methionine and tryptophan. The addition of 0.10 percent of 1-lysine increased growth rate and feed efficiency but did not greatly increase feed consumption. Supplements of methionine or tryptophan increased growth rate and feed efficiency but combinations of two or three amino acids did not give as great response as lysine alone. Two trials were conducted to determine the effect of supplementing a corn and soybean meal ration with lysine and methionine. Neither of the supplements alone or in combination increased growth rate but they did improve feed efficiency slightly. The requirements of the pig, expressed as a percent of the protein, appear to have been met by 5.0 percent 1-lysine, 3.5 percent methionine + cystine and 1.0 percent tryptophan. Copyright © . .