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Effect of Amino Acid Additions in a Fortified Casein-Lactose Diet for Early-Weaned Pigs

Illinois Agricultural Experiment Station, Urbana

Abstract

Two experiments, involving a total of 102 early-weaned pigs, were conducted to measure the effect upon pig gains of additions of arginine to diets unbalanced with excess protein, and of additions of arginine and of arginine plus glycine to diets unbalanced with excess methionine.

A significant (P<.01) growth depression resulted from feeding excessive protein levels in a casein-lactose diet. This depression appeared to result largely from reduced feed intake and was not affected by the addition of 1% L-arginine hydrochloride to the diet.

Pig gains were significantly (P<.01) depressed by the addition of 2.6% DL-methionine to a fortified, casein-lactose basal diet, and to diets supplemented with arginine or both arginine and glycine. Glycine, added at 1.3% of the diet, had no significant effect, but was tested only in the presence of arginine.

Arginine, added to a diet containing excess methionine, did not exert a protective effect; rather, a significantly (P<.01) greater growth depression resulted.

¹ Present address: Department of Animal Husbandry, University of Idaho, Moscow, Idaho.

² Present address: Department of Animal Husbandry and Nutrition, University of Florida, Gainesville, Florida.