QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Purchase Article View Shopping Cart Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Lewis, A. J. Articles by Moser, B. D. Search for Related Content PubMed PubMed Citation Articles by Lewis, A. J. Articles by Moser, B. D.

Determination of the Optimum Dietary Proportions of Lysine and Tryptophan for Growing Pigs Based on Growth, Food Intake and Plasma Metabolites¹

Department of Animal Science, University of Nebraska, Lincoln, Nebraska 68583

Weanling crossbred pigs were divided into 24 groups and fed one of three levels of lysine and one of eight levels of tryptophan in a 3 x 8 factorial design to determine the optimum dietary proportions of these two amino acids. Weight gain and feed efficiency, and changes in plasma levels of lysine, tryptophan and urea were the response criteria. The tryptophan "requirement" and the optimum lysine:tryptophan ratio were estimated for each of the three lysine levels. The data indicate a tryptophan requirement of 0.19% to 0.23% for the 3-week-old pig when the lysine level is adequate. For pigs of this age a lysine:tryptophan ratio of from 4 to 5 was about optimum.

KEY WORDS: • lysine • tryptophan • proportions • pigs • growth

¹ Published with the approval of the Director as Paper No. 5099, Journal Series, Nebr. Agr. Exp. Sta. Research reported was conducted under Project 13-11.

² Present address: Department of Animal Science, University of Alberta, Edmonton, Alberta, T6G 2E3, Canada.

³ To whom reprint requests should be addressed.

Manuscript received 17 May 1976.

This article has been cited by other articles:

				D. C. Kendall, A. M. Gaines, B. J. Kerr, and G. L. Allee True ileal digestible tryptophan to lysine ratios in ninety- to one hundred twenty-five-kilogram barrows J Anim Sci, November 1, 2007; 85(11): 3004 - 3012. [Abstract] [Full Text] [PDF]