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Tryptophan Requirement of Growing Pigs at Three Levels of Dietary Protein

University of Illinois^{3, 4,} at Urbana-Champaign, Urbana 61801

Abstract

Pigs averaging 11.3 and 9.5 kg were used in 3-week growth assays to determine the tryptophan requirement at 10, 14 and 18% dietary protein. Five levels of tryptophan (0.33, 0.50, 0.67, 0.83 and 1.00% of the protein) were fed at each level of dietary protein to duplicate groups of four pigs per pen. Corn-gelatin diets, fortified with all deficient amino acids except tryptophan, were used. In formulating the 10 and 14% protein diets, the levels of corn, gelatin and supplemental amino acids in the 18% protein diet were reduced in direct proportion to the reduction in protein level so as to insure a constant amino acid pattern in all three diets. The minimal level of tryptophan required for maximal weight gain was 0.71±0.09, 0.67±0.09 and 0.66±0.03% of the protein at 10, 14 and 18% dietary protein, respectively. When expressed as a percent of the diet, the need for tryptophan increased markedly from 0.071 to 0.119% as the protein level increased from 10 to 18%.

¹ Part of a thesis submitted to the Graduate College of the University of Illinois in partial fulfillment of the requirements for the Ph.D. degree.

² Present address: Maple Leaf Mills Ltd., 417 Queen's Quay West, Toronto, Ontario, Canada.

³ Department of Animal Science.

⁴ Work reported herein was supported in part by funds from the Illinois Agriculture Experiment Station.

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