Document Detail

Increasing dietary lysine increases final pH and decreases drip loss of broiler breast meat.
MedLine Citation:
PMID:  18281574     Owner:  NLM     Status:  MEDLINE    
Responses to increased dietary Lys concentrations were evaluated on 1,584 Ross 308 male broilers between 21 and 42 d of age housed according to 2 bird densities. The experimental design was composed of 8 factorial treatments: 2 bird densities (22 or 44 broilers/ 1.7 m(2) pen) x 4 true digestible (TD) Lys levels (0.83, 0.93, 1.03, and 1.13%). There were 6 repetitions per treatment. Birds were weighed individually at d 21 and 42. Feed consumption was recorded per pen. Body weight gain and feed conversion were calculated over the experimental period. Forty-eight broilers per treatment were dissected at 42 d of age. Final pH and drip loss during storage were measured on the pectoralis major. Density adversely affected feed intake (169 +/- 1 and 160 +/- 1 g/d with 22 and 44 birds per pen, respectively, P < 0.05), growth rate (97.4 +/- 0.5 and 91.0 +/- 0.7 g/d, P < 0.05), and feed conversion (1.730 +/- 0.008 and 1.760 +/- 0.006, P < 0.05). Except for feed intake, there was no interaction between the effects of bird density and dietary Lys. An increase in dietary TD Lys from 0.83 to 0.93% resulted in an increased growth rate (from 91.8 +/- 1.6 to 95.5 +/- 0.8 g/d, P < 0.05), improved feed conversion (from 1.783 +/- 0.008 to 1.742 +/- 0.009, P < 0.05), and increased breast meat yield (22.0 +/- 0.1% to 22.7 +/- 0.2%, P < 0.01). Performance and body composition traits were not significantly improved for concentrations of TD Lys higher than 0.93%. However, final breast pH increased from 0.83 up to 1.03% TD Lys in the diet (6.02 +/- 0.01 vs. 5.91 +/- 0.01, P < 0.05), and drip loss correlatively decreased (0.85 +/- 0.03% vs. 1.10 +/- 0.06, P < 0.05). This result opens new way of research for the definition of an amino acid requirement and on metabolic pathways involved in variations of breast muscle pH.
C Berri; J Besnard; C Relandeau
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Poultry science     Volume:  87     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  2008 Mar 
Date Detail:
Created Date:  2008-02-18     Completed Date:  2008-04-28     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  480-4     Citation Subset:  IM    
Institut National de la Recherche Agronomique, UR83 Recherches Avicoles, F-37380 Nouzilly, France.
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MeSH Terms
Animal Feed
Animal Nutritional Physiological Phenomena / physiology
Body Composition
Chickens* / growth & development,  metabolism
Dietary Proteins / administration & dosage,  metabolism*
Dose-Response Relationship, Drug
Energy Intake / physiology*
Hydrogen-Ion Concentration
Lysine / administration & dosage,  metabolism*
Meat / analysis,  standards*
Population Density
Random Allocation
Weight Gain
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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