Document Detail

Endogenous amino acid flow in broiler chicks is affected by the age of birds and method of estimation.
MedLine Citation:
PMID:  18029805     Owner:  NLM     Status:  MEDLINE    
The determination of ileal endogenous amino acid (IEAA) and total amino acid (TAA) concentrations is critical to standardizing amino acid digestibility coefficients. The IEAA and TAA flow in broiler chicks was measured on d 5, 15, and 21 at 2 geographical locations. Chicks were fed a nitrogen-free diet (NFD) or graded levels of casein (50, 100, or 150 g/kg of diet), which were assumed to be highly digestible. The IEAA and TAA flow (mg/kg of DM intake) on d 5 in chicks fed the NFD was higher (P < 0.05; Met = 154, Thr = 539) than values for d 15 (Met = 51, Thr = 274) and d 21 (Met = 50, Thr = 274). A comparison of the regression and NFD analyses showed higher (P < 0.05) flows on d 5 for those birds fed the NFD diet, with no differences between methods on d 15 and 21, with the exception of Lys, Met, and Glu (d 21). At all 3 ages evaluated, there was a linear increase (P < 0.05) in IEAA and TAA flows with increasing level of dietary casein. There was a decrease in IEAA and TAA flows that stabilized between d 15 and 21. The result suggests that the NFD and the regression method will give similar results on d 15 and 21. These observations also suggest that the relatively low apparent amino acid digestibility coefficients for broiler chicks at a younger age may be the result of a significantly high level of endogenous amino acid flow.
S A Adedokun; C M Parsons; M S Lilburn; O Adeola; T J Applegate
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Publication Detail:
Type:  Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Poultry science     Volume:  86     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  2007 Dec 
Date Detail:
Created Date:  2007-11-21     Completed Date:  2008-01-30     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2590-7     Citation Subset:  IM    
Department of Animal Sciences, Purdue University, 915 W. State Street, West Lafayette, IN 47907-2054, USA.
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MeSH Terms
Aging / physiology*
Amino Acids / administration & dosage,  metabolism*
Animal Feed
Animal Nutritional Physiological Phenomena
Caseins / metabolism,  pharmacology
Chickens / metabolism*
Diet / veterinary
Dietary Proteins / metabolism*
Dose-Response Relationship, Drug
Gastrointestinal Contents
Reg. No./Substance:
0/Amino Acids; 0/Caseins; 0/Dietary Proteins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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