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Evaluation of Supplemental Lysine for Practical Swine Rations

Chas. Pfizer & Co., Inc., Terre Haute, Indiana

Abstract

Experiments were conducted to test the effect of 0.1% supplemental lysine with baby pig rations of conventional composition and with growing-finishing rations based on corn-soybean oil meal, sorghum-soybean oil meal, and corn-peanut oil meal. Baby pigs on a 14% protein starter with added lysine grew at a rate equal to that of pigs on the basal 16% starter. In growing-finishing trial 1, the basal corn-soybean oil meal rations contained 14% protein, reduced to 12% at 125 lb. and 11% reduced to 9% at 125 lb. On the lower protein level, added lysine improved growth and feed efficiency, but it did not occur on the higher "normal" protein. In trial 2, with corn-soybean oil meal ration and protein levels of 14%–12% and 12.5%–10.5%, 0.1% added lysine significantly improved gain on the lower protein level so that the rate almost equaled that of the lot which received unsupplemented 14%–12% protein. However, lysine supplementation of a 14%–12% protein ration did not improve performance. Pigs on 12.5%–10.5% protein plus lysine exhibited better feed efficiency than those on 14%–12% protein with lysine and in this respect were about equal to those on the higher protein without lysine.

In trial 3, with low-lysine milo-soybean oil meal or corn-peanut oil meal rations containing 14%–12% protein, supplemental lysine (0.1%) significantly increased rate of gain and feed efficiency on both rations. There was a tendency toward improvement of some carcass characteristics in lysine-fed pigs of trial 3.