HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) 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 Russell, L. E. Articles by Stahly, T. S. Search for Related Content PubMed PubMed Citation Articles by Russell, L. E. Articles by Stahly, T. S.

Tryptophan, Threonine, Isoleucine and Methionine Supplementation of a 12% Protein, Lysine-Supplemented, Corn-Soybean Meal Diet for Growing Pigs^1,2,

University of Kentucky Lexington 40546-0215

Abstract

Five experiments were conducted to assess the value of supplemental amino acids (tryptophan, threonine, isoleucine and methionine) in a lysine-fortified, 12% protein, corn-soybean meal diet for growing pigs (18 to 35 kg). Methionine, as methionine hydroxy analog, was included in the basal diet in all experiments except one, in which the need for supplemental methionine was evaluated. The low protein, basal diet was supplemented with .3% lysine to provide a level equivalent to that in a 16% protein, corn-soybean meal diet. The basal diet was calculated to contain .14% tryptophan, while analyzed levels ranged from .13 to .15% tryptophan. The addition of tryptophan alone (.015 to .045%) to the lysine-methionine fortified basal diet failed to improve growth rate, efficiency of feed utilization or N retention. Similarly, threonine supplementation (.1%) of the basal diet did not affect performance. However, the combination of .04% tryptophan and .1% threonine significantly improved growth rate and feed:gain ratio to a level equivalent to that of pigs fed the 16% protein, positive control diet. Supplemental isoleucine (.1%) in the presence of added tryptophan or tryptophan and threonine was without effect. In the experiment in which the need for methionine supplementation was evaluated, methionine addition (.1%) to the lysine-fortified basal diet improved growth rate, but not feed efficiency. Methionine had no effect on the response to either threonine or tryptophan addition. A titration experiment indicated that supplementation of .03% tryptophan to a lysine-methionine-threonine fortified basal diet supported optimal growth rate and feed efficiency of pigs. The results suggest that the growing pig (18 to 34 kg) allowed to consume a corn-soybean meal diet ad libitum requires approximately .17% total tryptophan (.13% available tryptophan) for optimal performance.

¹ Journal Paper No. 82-5-101 of the Kentucky Agr. Exp. Sta., Dept. of Anim. Sci.

² This research was supported in part by a grant-in-aid from Ajinomoto, Inc., Tokyo

³ Current address: Anim. Sci. Dept., Univ. of Illinois, Urbana 61801

This article has been cited by other articles:

				M. Barrera, M. Cervantes, W. C. Sauer, A. B. Araiza, N. Torrentera, and M. Cervantes Ileal amino acid digestibility and performance of growing pigs fed wheat-based diets supplemented with xylanase J Anim Sci, July 1, 2004; 82(7): 1997 - 2003. [Abstract] [Full Text] [PDF]

				J. L. Figueroa, A. J. Lewis, P. S. Miller, R. L. Fischer, R. S. Gomez, and R. M. Diedrichsen Nitrogen metabolism and growth performance of gilts fed standard corn-soybean meal diets or low-crude protein, amino acid-supplemented diets J Anim Sci, November 1, 2002; 80(11): 2911 - 2919. [Abstract] [Full Text] [PDF]

				M. De la Llata, S. S. Dritz, M. D. Tokach, R. D. Goodband, and J. L. Nelssen Effects of increasing L-lysine HCl in corn- or sorghum-soybean meal-based diets on growth performance and carcass characteristics of growing-finishing pigs J Anim Sci, September 1, 2002; 80(9): 2420 - 2432. [Abstract] [Full Text] [PDF]