Document Detail

Genetic parameters for calving ease and survival at birth in Angus field data.
MedLine Citation:
PMID:  1778807     Owner:  NLM     Status:  MEDLINE    
Calving performance records from the American Angus Herd Improvement Registry files were used to estimate variance components for calving ease and survival to 24 h. Genetic parameters for direct and maternal effects were estimated by using a sire-maternal grandsire model. Data included two independent samples of 19 and 34 herds with complete calving information. Maternal variance for calving ease was much larger than the variance for the direct effect of the sire. Maternal heritability for calving ease was .27 and .20 in the two samples of herds, respectively. Heritabilities for direct effects were .21 and .07. The genetic correlations between direct and maternal effects were -.93 and -.80. There was little genetic variation in survival at birth. Parameter estimates were within the allowable parameter space in the sample of 19 herds. Heritability for the direct effect of the sire on survival was .04. Maternal heritability was .09, and the direct-maternal correlation was -.85.
A C Cubas; P J Berger; M H Healey
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of animal science     Volume:  69     ISSN:  0021-8812     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  1991 Oct 
Date Detail:
Created Date:  1992-03-12     Completed Date:  1992-03-12     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  3952-8     Citation Subset:  IM    
Iowa State University, Ames 50011.
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MeSH Terms
Analysis of Variance
Animals, Newborn / growth & development*
Cattle / genetics*,  growth & development,  physiology
Genetic Variation*
Labor, Obstetric / genetics*

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