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Quantitative Phenylalanine Requirement of the Weanling Pig¹

Purdue University Agricultural Experiment Station

Abstract

Semi-purified diets containing corn, dextrose, vitamins, minerals, and amino acids were used to determine the phenylalanine requirement of the weanling pig. The basal ration contained 0.37 percent total digestible aromatic amino acids (0.23 percent phenylalanine plus 0.14 percent tyrosine) from corn. Other rations included sufficient DL-phenylalanine to supply 0.46, 0.56, and 0.66 percent of these two amino acids in the diet, the tyrosine level remaining at 0.14 percent in all cases.

Maximum gains and feed utilization were obtained with 0.32 percent phenylalanine and 0.14 percent tyrosine in the ration. Assuming that the 0.14 percent tyrosine substituted for an equal weight of phenylalanine, the phenylalanine requirement of the weanling pig is 0.46 percent of the ration. This value is equivalent to 4.0 percent of the digestible crude protein or 3.6 percent of the total protein in the diet.

¹ Contributed by the Departments of Biochemistry and Animal Husbandry, Purdue University, Lafayette, Indiana, Journal Paper No. 783.

² The authors express sincere appreciation to Dr. R. W. Colby, Dow Chemical Company, Midland, Michigan, for supplying many of the amino acids. The DL-threonine was obtained from the Special Chemicals Division, Winthrop Steams Inc., New York City.