Document Detail


Genetic, phenotypic, and environmental parameter estimates of calving difficulty, weight, and measures of pelvic size in beef heifers.
MedLine Citation:
PMID:  1808175     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The heritabilities for and the genetic, phenotypic, and environmental correlations among calving difficulty scores (CDS) and measures of size of the pelvic inlet were estimated using 547 records of 2-yr-old heifers from three synthetic breed groups. Calving difficulty score was treated first as a trait of the dam and then as a trait of the calf and was analyzed on three scales: raw scores from 0 to 3 (0 = normal birth, 3 = most difficult delivery requiring a hard pull, veterinary assistance, or surgical intervention), Snell-transformed scores, and a binary (0, 1) scale. Estimates of heritability for CDS as a trait of the dam were similar to those when it was considered a trait of the calf. Heritability estimates for CDS on the raw and transformed scales were similar and moderate in magnitude (.36 +/- .15 to .47 +/- .18) but were higher than most reported estimates. However, on the binary scale the estimates were lower (.26 +/- .17, .28 +/- .14). Estimates of heritability for the horizontal and vertical pelvic diameters and the pelvic area were high, implying that pelvic size in heifers might be readily modified by selection. The genetic and phenotypic correlations between CDS as a dam trait and pelvic dimensions were low, whereas the correlations between CDS and dam weight at calving were moderate. As a calf trait, CDS was highly correlated genetically with calf birth weight, but the phenotypic correlations were moderate.
Authors:
A Naazie; M Makarechian; R T Berg
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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 Dec 
Date Detail:
Created Date:  1992-05-21     Completed Date:  1992-05-21     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:  4793-800     Citation Subset:  IM    
Affiliation:
Dept. of Anim. Sci., University of Alberta, Edmonton, Canada.
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MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Animals
Birth Weight / genetics
Body Weight / genetics
Breeding
Cattle
Cattle Diseases / genetics*,  pathology,  prevention & control
Dystocia / genetics,  pathology,  prevention & control,  veterinary*
Female
Genetic Variation
Pelvis / pathology*
Phenotype
Pregnancy

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


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