Study of breed formtion process in sheep with multidimensional methods for analyzing genetic and morphological distances
1991
Glazko, V.I. | Krutovskii, K.V.
This paper compares biochemical genetic variation with the variation of a number of morphological traits in a real breed formation process involving creation of a new sheep breed group through multibreed crossing. The genetic distances calculated from biochemical markers by different methods (the Nei, Cavalli-Sforza/Edwards, and Rogers techniques) exhibited highly reliable correlations with the Manhattan and average taxonomic distances calculated on the basis of six morphological traits (r = 0.814-0.889, t = 2.98-2.99, and P = 0.999). Nevertheless, the genetic correlations among the crossbred animals identified from the genetic distance matrix by use of multidimensional analysis methods (the principal coordinate and multidimensional scaling techniques) correspond more precisely to the actual breeding scheme and its thrust than application of these methods to the morphological distance matrix. That the data on changes in genetic structure for the groups of animals studied correspond more closely to the actual breeding process than those on morphological traits is thought to be a consequence of direct involvement in the breeding process of phenotypic characteristics that cannot be taken into account.
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