Effect of the Addition of Lysine and Virginiamycin to Corn-Soybean Meal Rations on Performance of Weanling Pigs

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Abstract
Four growth trials were conducted with weanling pigs and two with weanling rats to study the effect of adding virginiamycin and/or lysine singly or in combination to a 12% protein corn-soybean meal basal ration. A level of 0.16% supplemental L-lysine resulted in a significant increase in average daily gain in two of the four swine trials and a tendency (non-significant) for improvement in the other two trials. In the rat trials weight gain and feed per unit of gain were both significantly increased by lysine. Virginiamycin, at a level of 20 mg. per pound of feed resulted in a significant increase in average daily gain in two of three swine trials and a tendency (non-significant) for improvement in the third. It had no significant effect on any criteria in the rat trial. When data from the pigs in trials 1, 2 and 3 during the first 35 days were combined, lysine and virginiamycin were each found to have a significant effect on average daily gain. There was no lysine x virginiamycin interaction. Copyright © 1963. American Society of Animal Science . Copyright 1963 by American Society of Animal Science