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Interrelationships of Protein, Lysine and Energy in Diets for Growing Swine

University of Georgia,^,3 Athens

Abstract

Sixty pigs were employed in a 2 x 2 x 3 factorial experiment in which the primary treatment effects were protein, lysine, and energy.

During the first 42 days of the experiment significantly faster gains were obtained with pigs fed rations containing 18% protein than with those fed rations containing 14% protein. A highly significant depression in rate of gain resulted when 1-lysine hydrochloride was added at a level of 0.1% of the ration. This inhibitory effect appeared to be reduced as the caloric density of the ration was increased. Increasing the caloric density of the ration resulted in a highly significant linear increase in gains with a corresponding decrease in the quantity of feed required to produce a unit of gain.

¹ Present address: Department of Animal Husbandry, Cornell University, Ithaca, N. Y.

² The authors wish to acknowledge American Cyanamid Co., Pearl River, N. Y.; E. I. DuPont de Nemours and Co., Wilmington, Delaware; and Dawes Laboratories, Inc., Chicago, Ill. for supplying products used in this experiment. Acknowledgment is also due J. L. Cannon for assistance in the statistical evaluation of the results and to A. M. Lynn, Herdsman, for aid in caring for the animals.

³ Contribution from the Department of Animal Husbandry. Georgia journal paper no. 58 of the College Experiment Station.