Document Detail

Directional and anteroposterior asymmetry of common white markings in the legs of the Arabian horse: response to selection.
MedLine Citation:
PMID:  9692229     Owner:  NLM     Status:  MEDLINE    
Arabian bay horses manifest, on the average, more common white markings in their hind legs than their forelegs (anteroposterior asymmetry) and more common white markings in their left legs than their right legs (directional asymmetry). To determine if genetic variation exists for these types of asymmetry, the phenotypic response was studied in bay foals when their dams and sires were selected for the directions of fore-hind and left-right differences. In the fore-hind studies, the quantitative shifts in the bay foals were in the direction specified by the selection scheme and the observed deviations were all statistically significant. The shifts were also consistently in the direction favored by selection in the left-right studies, but only two of six observed deviations were statistically significant using a one-tailed test of significance. Thus, only marginal statistical evidence is available to support the observed consistent responses to selection in the left-right studies. These differential responses are reflected in the magnitudes of the heritability estimates. Based on the overall results, it is concluded that both types of asymmetry have a genetic basis in the Arabian horse, but much more genetic variation is present for anteroposterior asymmetry than for directional asymmetry.
C M Woolf
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Genetica     Volume:  101     ISSN:  0016-6707     ISO Abbreviation:  Genetica     Publication Date:    1997-1998
Date Detail:
Created Date:  1998-09-14     Completed Date:  1998-09-14     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0370740     Medline TA:  Genetica     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  199-208     Citation Subset:  IM    
Arizona State University, Department of Zoology, Tempe 85287-1501, USA.
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MeSH Terms
Hair Color / genetics*
Horses / anatomy & histology,  genetics*
Selection, Genetic

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