Document Detail

Dietary lysine needs of late-developing heavy broilers.
MedLine Citation:
PMID:  16553276     Owner:  NLM     Status:  MEDLINE    
Two studies were conducted to determine the response of late-developing broiler males and females to dietary Lys from 42 to 56 d of age. Hubbard Ultra Yield males and females were placed at separated ends of a floor pen broiler house and raised on common diets. At 42 d of age, broilers were then fed 1 of 7 gradient concentrations of dietary Lys that progressively increased by 0.07% from 0.68 to 1.10% total Lys. Regression analysis was performed to estimate dietary Lys needs in the presence of quadratic responses. Female broilers did not respond to dietary Lys for any variable measured. Gradient additions of Lys improved feed conversion linearly (P < 0.01) for male broilers. Fillet weight, tender weight, and their composite increased linearly (P < 0.05) with Lys supplementation in male broilers. Quadratic responses were exhibited by carcass yield, fillet yield, and total breast meat yield, resulting in total Lys optimization dietary levels of 0.88, 0.93, and 0.93%, respectively, in male broilers. Based on results from this study, high-yield male broilers should be fed a minimum of 0.93% total dietary Lys (0.85% calculated digestible) from 42 to 56 d of age. Lack of response by female broilers suggests that less dietary Lys may be needed for adequate growth and meat yield.
A Corzo; W A Dozier; M T Kidd
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Poultry science     Volume:  85     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  2006 Mar 
Date Detail:
Created Date:  2006-03-23     Completed Date:  2006-05-31     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  457-61     Citation Subset:  IM    
Department of Poultry Science, Mississippi State University, Mississippi State 39762, USA.
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MeSH Terms
Animal Nutritional Physiological Phenomena*
Body Composition / drug effects
Chickens / growth & development*,  metabolism*
Diet / veterinary*
Dose-Response Relationship, Drug
Lysine / administration & dosage*,  pharmacology*
Sex Characteristics
Weight Gain / drug effects
Reg. No./Substance:

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

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