J. Anim Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Burgoon, K. G.
Right arrow Articles by Gregg, E. J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Burgoon, K. G.
Right arrow Articles by Gregg, E. J.

Journal of Animal Science, Vol 70, Issue 8 2493-2500, Copyright © 1992 by American Society of Animal Science

JOURNAL ARTICLE

Digestible tryptophan requirements of starting, growing, and finishing pigs

K. G. Burgoon, D. A. Knabe and E. J. Gregg
Department of Animal Science, Texas A&M University, College Station 77843.

Seven hundred eight crossbred pigs were used in growth and digestion trials to determine the digestible tryptophan (Trp) requirement of starting (6 to 16 kg), growing (22 to 50 kg), and finishing (55 to 97 kg) pigs. Each growth trial evaluated a corn-fish meal-corn gluten meal basal diet, the basal diet with five incremental additions of L-Trp, and a control corn-soybean meal diet. The tryptophan content of the six incremental diets ranged from .13 to .255% for starting pigs, .08 to .18% for growing pigs, and .063 to .163% for finishing pigs. Lysine contents of basal diets were 1.38, .90, and .72% for starting, growing, and finishing diets, respectively. In all trials, ADG, ADFI, and gain/feed increased (P less than .001) linearly and quadratically as dietary Trp increased. Broken-line regression analyses determined the total dietary Trp requirements needed to optimize performance to be .19, .13, and .09% (as-fed basis) for starting, growing, and finishing pigs, respectively. These concentrations equated to Trp intakes of .96, 2.18, and 2.88 g/d. A digestion trial using growing pigs (29 kg initially) determined the apparent ileal digestibility of Trp in the basal starting and growing diets to be 72 and 70%, respectively; a similar trial with finishing pigs (55 kg initially) found 59% Trp digestibility for the basal finishing diet. Mean digestibility of L-Trp was 97%. Based on these values and the total Trp requirements given above, the digestible Trp requirements are .15, .10, and .06% for starting, growing, and finishing pigs, respectively.


This article has been cited by other articles:


Home page
 J ANIM SCIHome page
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]

Home page
 J ANIM SCIHome page
A. C. Guzik, J. L. Shelton, L. L. Southern, B. J. Kerr, and T. D. Bidner
The tryptophan requirement of growing and finishing barrows
J Anim Sci, June 1, 2005; 83(6): 1303 - 1311.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
A. C. Guzik, L. L. Southern, T. D. Bidner, and B. J. Kerr
The tryptophan requirement of nursery pigs
J Anim Sci, October 1, 2002; 80(10): 2646 - 2655.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1992 by the American Society of Animal Science.