Document Detail

Skeletal muscle fibre growth and growth associated myopathy in the domestic chicken (Gallus domesticus).
MedLine Citation:
PMID:  16787849     Owner:  NLM     Status:  MEDLINE    
1. Genetic selection of broilers may have pushed muscle fibres to their maximum functional size constraints. Broiler (B), female great-grandparent (GGP) and layer (L) lines were weighed, blood sampled and killed from 5 to 25 weeks of age. 2. At 25 weeks, Pectoralis major (Pm) fibre size reached by the B (65.9 microm) and GGP (59.8 microm) were 1.5 times greater than the L (38.1 microm). In the B and GGP lines, fibre growth of the Pm markedly exceeded that of the Biceps femoris (Bf) muscle. However, in the L line, fibre growth of the Pm and Bf muscle was comparable. Connective tissue content was generally higher in the Bf than in the Pm of all lines. 3. Centralised nuclei were observed predominantly in Pm, and may regulate fibre size. Both large muscle fibres and inadequate capillary supply may induce metabolic stress in B and GGP lines due to the large diffusion distances for oxygen, metabolites and waste products. 4. Enzyme markers of muscle damage (creatine kinase (CK), lactate dehydrogenase (LDH) and aspartate aminotransaminase (AST)) and histopathological analysis of Pm and Bf indicated greater myopathy in B and GGP vs L. 5. Regenerative processes were associated with oestrogen secretion. Reduced CK and LDH preceded egg yolk precursor production and increased calcium uptake for eggshell synthesis in all three lines. Oestrogen may stimulate muscle fibre regeneration and recovery as a myo-protective adaptation to potentially detrimental changes in calcium economy during egg production.
V E MacRae; M Mahon; S Gilpin; D A Sandercock; M A Mitchell
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  British poultry science     Volume:  47     ISSN:  0007-1668     ISO Abbreviation:  Br. Poult. Sci.     Publication Date:  2006 Jun 
Date Detail:
Created Date:  2006-06-21     Completed Date:  2006-08-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  15740290R     Medline TA:  Br Poult Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  264-72     Citation Subset:  IM    
Roslin Institute (Edinburgh), Roslin, Midlothian, Scotland, UK.
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MeSH Terms
Creatine Kinase / metabolism
Genetic Predisposition to Disease
Muscle, Skeletal / enzymology,  growth & development*
Muscular Diseases / genetics,  veterinary*
Poultry Diseases / genetics*
Reg. No./Substance:
EC Kinase

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

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