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Quantitative Valine Requirement of the Weanling Pig¹

Departments of Agricultural Chemistry and Animal Husbandry, Purdue University, Lafayette, Indiana

Weanling pigs were grown on corn-amino acid diets of equal nitrogen content which contained sufficient DL-valine to provide utilizable L-valine at levels of 0.3, 0.4, 0.5, 0.6 and 0.7% of the diet. The rate of gain and efficiency of feed utilization were markedly inferior at the 0.3% L-valine level, while the gain and feed utilization were uniformly high when the diet contained 0.4 to 0.7% L-valine. Assuming that D-valine is inactive, these data suggest that the L-valine requirement of the weanling pig is 0.4% of the total diet, 3.6% of the digestible crude protein, or 3.1% of the total crude protein.

The high quality of the protein in the corn-amino acid diets was demonstrated by a protein efficiency of 3.2 at the 0.4% L-valine level.

Presented at the meetings of the Federation of American Societies for Experimental Biology, Chicago, Illinois, April, 1953.

The authors wish to express their appreciation to Dr. R. W. Colby, Dow Chemical Company, Midland, Michigan, for generously supplying many of the amino acids.

Manuscript received 9 May 1953.