Document Detail

Performance of different broiler genotypes fed diets with varying levels of dietary crude protein and lysine.
MedLine Citation:
PMID:  16776474     Owner:  NLM     Status:  MEDLINE    
Two experiments were conducted to determine if a 3-way interaction among genotype, dietary lysine, and CP is an important influence on dietary responses. The genotypes were Ross 308 and Cobb in experiment 1 and Ross 508 and Arbor Acres Classic in experiment 2. The experimental designs were completely randomized with an incomplete 2 x 2 x 3 factorial arrangement of treatments. On d 7 of experiment 1, 4 replicate pens of 6 chicks each were fed 1 combination of dietary lysine and CP (17% CP with 0.6, 0.7, and 0.8% lysine and 23% CP with 0.7, 0.8, and 0.9% lysine) until d 21. On d 17 of experiment 2, 4 replicate pens of 35 chicks each were fed 1 combination of dietary lysine and CP (17% CP with 0.7, 0.8, and 0.9% lysine and 23% CP with 0.8, 0.9, and 1.0% lysine) until d 42. On d 43 of experiment 2, 3 birds per pen were processed. Regression analysis showed differences (P < 0.05) due to genotype for body weight gain (BWG), feed intake, and feed conversion ratio (FCR) in experiment 1, and BWG, carcass yield, breast fillet and tender yields, and abdominal fat pad percentage in experiment 2. Increasing dietary CP decreased abdominal fat pad percentage in both experiments; however, increasing dietary lysine only decreased this parameter in the starter-phase chicks. In both experiments, Ross broilers had a greater response to supplemental lysine when 17% CP was fed, but less response to supplemental lysine when 23% CP was fed for both BWG and FCR (3-way interaction). Three-way interactions between dietary CP and lysine levels and genotype were observed for BWG (P < 0.01), feed intake (P < 0.01), and FCR (P < 0.02) in experiment 1 and for feed intake (P < 0.06) and FCR (P < 0.03) in experiment 2. The 3-way interactions demonstrate that quantitative differences exist between genotypes in response to increasing dietary levels of CP and lysine.
K G Sterling; G M Pesti; R I Bakalli
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Poultry science     Volume:  85     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  2006 Jun 
Date Detail:
Created Date:  2006-06-16     Completed Date:  2006-07-05     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1045-54     Citation Subset:  IM    
Department of Poultry Science, University of Georgia, Athens 30602-2772, USA.
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MeSH Terms
Adipose Tissue
Animal Nutritional Physiological Phenomena
Body Composition / genetics
Chickens / genetics*
Dietary Proteins / administration & dosage*
Eating / genetics
Lysine / administration & dosage*
Muscle, Skeletal
Nutritional Requirements
Regression Analysis
Species Specificity
Weight Gain / genetics
Reg. No./Substance:
0/Dietary Proteins; 56-87-1/Lysine

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

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