Poult. 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 Edwards, H.
Right arrow Articles by Baker, D.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Edwards, H., 3rd
Right arrow Articles by Baker, D.
Poultry Science, Vol 78, Issue 10, 1418-1423
Copyright © 1999 by Poultry Science Association

Articles

Maintenance sulfur amino acid requirements of young chicks and efficiency of their use for accretion of whole-body sulfur amino acids and protein

HM Edwards 3rd and DH Baker

Department of Animal Sciences, University of Illinois, Urbana 61801, USA.

Peterson x Hubbard male chicks were used in two bioassays conducted to determine the maintenance requirement and efficiency of utilization of dietary Met and Cys in young chicks. In each assay, chicks were given free access for 10 d to crystalline amino acid (AA) diets containing graded levels of DL-Met (Assay 1) or graded equal levels of DL-Met and L-Cys (Assay 2). Doses of Met represented 5, 10, 40, 55, 70, and 95% of its ideal level in Assay 1, with all other AA maintained at minimized excess levels that were 15% (of ideal) above the various doses of Met, except for Cys, which was maintained at 100% of its ideal level for all treatments. For example, when Met was fed at 40% of its ideal level, all other AA were fed at 55% of their ideal levels, and Cys was fed at 100%. In Assay 2, Met and Cys were fed at equal levels representing 5, 10, 40, 55, 70, and 95% of ideal with all other AA maintained at minimized excess levels that were 15% (of ideal) above the various doses of Met + Cys. After 24 h of feed deprivation, chicks were killed for whole-body protein and AA analysis. In Assay 1, Met accretion was a linear (P < 0.01) function of Met intake (r2 = 0.97). The slope of the Met accretion regression line indicated that 68% of the crystalline Met ingested (above maintenance) was retained. In Assay 2, increases in whole-body protein and whole-body TSAA were linear (P < 0.01) between dosage levels of 5 and 70% of the ideal TSAA level. Slope of the TSAA accretion line between these dose levels indicated that 52% of the TSAA was retained. The TSAA requirement for zero protein accretion was calculated to be 3.2 mg/d or 9.4 mg/d per kg3/4, whereas the TSAA required for zero TSAA accretion was 5.3 mg/d or 15.3 mg/d per kg3/4.


This article has been cited by other articles:


Home page
 Poult. Sci.Home page
Samadi and F. Liebert
Threonine Requirement of Slow-Growing Male Chickens Depends on Age and Dietary Efficiency of Threonine Utilization
Poult. Sci., June 1, 2007; 86(6): 1140 - 1148.
[Abstract] [Full Text] [PDF]

Home page
 Poult. Sci.Home page
Samadi and F. Liebert
Estimation of Nitrogen Maintenance Requirements and Potential for Nitrogen Deposition in Fast-Growing Chickens Depending on Age and Sex
Poult. Sci., August 1, 2006; 85(8): 1421 - 1429.
[Abstract] [Full Text] [PDF]

Home page
 J. Nutr.Home page
D. H. Baker
Animal Models of Human Amino Acid Responses
J. Nutr., June 1, 2004; 134(6): 1646S - 1650S.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1999 by the Poultry Science Association.