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Effect of the Addition of Lysine and Virginiamycin to Corn-Soybean Meal Rations on Performance of Weanling Pigs¹

Cornell University, ² Ithaca, New York

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.

¹ Acknowledgment is made to Smith Kline and French Laboratories, Philadelphia, Pennsylvania, for partial support of this work through financial assistance and materials, to Merck and Company, Rahway, New Jersey, for materials and to Miss S. Spitz for performing proximate analyses on the feeds.

² Department of Animal Husbandry.