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The Influence of Tryptophan, Methionine and Lysine Supplementation of a Corn-Soybean Oil Meal Diet on Nitrogen Balance of Growing Swine¹

Nebraska Agricultural Experiment Station⁴

Abstract

MANY investigations have been conducted to determine the amino acid content of a wide variety of feedstuffs, many of which are commonly used in typical swine diets (Block and Mitchell, 1946; Baumgarten et al., 1946; Williams et al., 1955). The lysine requirement for growing pigs has been reported by Mertz et al. (1949), Brinegar et al. (1950) and Shelton et al. (1951a). A strict tryptophan deficiency was first produced in growing pigs by Beeson et al. (1949), and the requirement set forth by the National Research Council (1953) is based on the work of Shelton et al. (1951b, 1951c). Bell et al. (1950) and Curtin et al. (1952) have reported the methionine requirement for growing swine. A comparison of these reported essential amino acid requirements of growing pigs with calculated amino acid content of many practical diets, particularly those containing lower levels of protein, reveals that many such diets may be inadequate in these essential amino acids.

Several workers (Bloss et al., 1953; Terrill et al., 1954; Henson et al., 1955) have recently demonstrated that the addition of small amounts of dl-tryptophan to corn-meat by-product type of diets improved them for growing-fattening pigs.

¹ Published with the approval of the Director as Paper No. 724, Journal Series. A part of the thesis submitted by the author to the graduate college, University of Illinois, Urbana, in partial fulfillment of the requirements for the Doctor of Philosophy Degree.

² Acknowledgment is made of partial support of this investigation through contributions of funds or supplies by Dow Chemical Company, Midland, Michigan; E. I. duPont deNemours and Co., Inc., Wilmington, Delaware; Merck and Co., Inc., Rahway, New Jersey; Chas. Pfizer and Company, Inc., Brooklyn, New York; and Swift and Company, Chicago, Illinois.

³ Dr. Ruth M. Leverton and associates, Human Nutrition Laboratory, University of Nebraska, generously made the amino acid analyses. Dr. C. W. Ackerson and associates, Department of Biochemistry and Nutrition, University of Nebraska, assisted with the nitrogen determinations. Messrs. Fred Krieger and Ward Lingo helped with the feeding and caring for experimental animals.

⁴ Lincoln.