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Quantitative DL-Tryptophan Requirement of the Weanling Pig¹

Purdue University Agricultural Experiment Station

Abstract

Purified diets containing zein and gelatin, plus amino acid supplements, have been used to determine the level of DL-tryptophan required by weanling Duroc pigs. In the presence of adequate nicotinic acid maximum growth was obtained when DL-tryptophan constituted 0.2%, or more, of the diet.

Pigs receiving 0.1% DL-tryptophan consumed approximately one-half as much feed, and gained at about one-third the rate of the pigs receiving 0.2% DL-tryptophan. The feed efficiency of the pigs receiving the lower level of DL-tryptophan was reduced.

¹ Contribution from the Departments of Agricultural Chemistry and Animal Husbandry, Journal paper No. 463, Purdue University Agricultural Experiment Station, Lafayette, Indiana.

² The authors are grateful to Dr. J. Waddell, E. I. duPont de Nemours and Co., New Brunswick, New Jersey, for the DL-lysine HCl, and to Mr. A. Lee Caldwell, Eli Lilly & Co., Indianapolis, Ind., for the liver extract used in these experiments.