Document Detail

Genetic study of embryonic mortality in White Leghorn lines selected for egg production traits.
MedLine Citation:
PMID:  10579403     Owner:  NLM     Status:  MEDLINE    
The present study compares embryonic mortality between lines selected for different production traits, assesses the effects of inbreeding of the hen and embryo on embryonic mortality, and estimates genetic parameters of embryonic mortality. The experiment covered 10 generations of selection for increased egg number (EN), egg weight (EW), egg mass (EM) and a control line (C). The data included age at 1st egg, egg number and egg weight. Percent fertile eggs (PF), percent hatched of fertile eggs (PHF) and percent dead chick at hatch (PDH) were also recorded for the selected parents. PDH was higher in the selected lines than in the control line. Among the selected lines, the EW line had the highest embryonic mortality. Inbreeding of the hen and embryo had no significant effect on PDH in any of the lines. Estimates of heritability for PDH were 0.10+/-0.05, 0.02+/-0.02, 0.03+/-0.02 and 0.02+/-0.02 for lines EN, EW, EM and C, respectively. There was a positive genetic correlation between egg weight and PDH in line EW indicating that selection for increased egg weight was associated with high embryonic mortality. A negative genetic correlation between PDH and reproductive traits in line EN was observed, which is favourable.
A Sewalem; M Wilhelmson
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  British poultry science     Volume:  40     ISSN:  0007-1668     ISO Abbreviation:  Br. Poult. Sci.     Publication Date:  1999 Sep 
Date Detail:
Created Date:  1999-12-09     Completed Date:  1999-12-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  15740290R     Medline TA:  Br Poult Sci     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  467-71     Citation Subset:  IM    
Centre for Reproductive Biology, Swedish University of Agricultural Sciences, Uppsala.
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MeSH Terms
Chick Embryo / physiology*
Chickens / genetics*
Crosses, Genetic
Eggs / standards
Species Specificity

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

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