Document Detail

Variance and covariance estimates for weaning weight of Senepol cattle.
MedLine Citation:
PMID:  1778806     Owner:  NLM     Status:  MEDLINE    
Variance and covariance components were estimated for weaning weight from Senepol field data for use in the reduced animal model for a maternally influenced trait. The 4,634 weaning records were used to evaluate 113 sires and 1,406 dams on the island of St. Croix. Estimates of direct additive genetic variance (sigma 2A), maternal additive genetic variance (sigma 2M), covariance between direct and maternal additive genetic effects (sigma AM), permanent maternal environmental variance (sigma 2PE), and residual variance (sigma 2 epsilon) were calculated by equating variances estimated from a sire-dam model and a sire-maternal grandsire model, with and without the inverse of the numerator relationship matrix (A-1), to their expectations. Estimates were sigma 2A, 139.05 and 138.14 kg2; sigma 2M, 307.04 and 288.90 kg2; sigma AM, -117.57 and -103.76 kg2; sigma 2PE, -258.35 and -243.40 kg2; and sigma 2 epsilon, 588.18 and 577.72 kg2 with and without A-1, respectively. Heritability estimates for direct additive (h2A) were .211 and .210 with and without A-1, respectively. Heritability estimates for maternal additive (h2M) were .47 and .44 with and without A-1, respectively. Correlations between direct and maternal (IAM) effects were -.57 and -.52 with and without A-1, respectively.
D W Wright; Z B Johnson; C J Brown; S Wildeus
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Publication Detail:
Type:  Journal Article    
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:  3945-51     Citation Subset:  IM    
Dept. of Anim. and Poult. Sci., University of Arkansas, Fayetteville 72701.
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MeSH Terms
Analysis of Variance
Body Weight / genetics*
Cattle / genetics*,  growth & development
Genetic Variation*
Models, Genetic*

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