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Addition of Lysine and/or a Tranquilizer to Low Protein, Soybean Meal Supplemented Rations for Growing Bacon Pigs

University of Alberta,^,2 Edmonton, Canada

Abstract

An experiment was conducted during two seasons to study the value of 0.2 L-lysine and/or of 1 mg. of hydroxyzine hydrochloride per pound of ration as supplements to a low protein ration for growing pigs.

The addition of lysine to a 13% protein (0.55% lysine) barley-wheat-SBM growing ration for individually-fed pigs from 36 to 110 lb. liveweight increased rate of gain and efficiency of feed utilization so that they were essentially equal to those obtained with a 16% protein (0.75% lysine) ration. The pigs receiving the lower protein, 7% SBM, ration without supplemental lysine gained 10% more slowly and required 13% more feed per pound gain than those fed the higher protein, 15% SBM, ration. The addition of hydroxyzine hydrochloride to the lower protein ration during the growing period did not influence rate of gain or efficiency of feed utilization.

The results of an experiment with weanling rats were similar to those obtained with growing pigs, except that supplemental lysine failed to raise the performance of the rats to as high a level as that of rats receiving a higher protein diet.

All pigs were finished from 110 lb. to market weight of over 190 lb. on the 13% protein ration with or without tranquilizer. Hydroxyzine hydrochloride had no influence during this period. For the entire growing and finishing period there were no significant differences between lots in rate and efficiency of gain. Carcass characteristics, with the exception of length, were not significantly influenced by the ration fed, but pigs receiving higher protein or supplemental lysine in their growing rations had loin areas that were 6% larger than those fed lower protein rations without lysine.

The barrows gained more rapidly than the gilts but the gilts had longer carcasses with less average backfat. There were several replicate differences associated with rate of gain and carcass characteristics.

¹ The author acknowledges the assistance of Merck and Co. Ltd., Montreal; Pfizer Canada, Montreal; and N. D. Hogg Ltd., Toronto in supplying supplements and vitamins used in these experiments.

² Department of Animal Science.