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Standardbred stallion gene transmission for twelve protein systems: evidence for selection in trotters
L R Weitkamp1, J W MacCluer, S A Guttormsen
1Department of Psychiatry, University of Rochester Medical Center, New York 14642.
Abstract:
The transmission ratios of alleles at 12 protein marker loci were computed individually for American Standardbred stallions in a genealogy of 5392 phenotyped horses. Over all loci there was significant gene transmission distortion for trotting stallions (p = 0.0019) but not for pacing stallions (p = 0.99). The transmission distortion was due to sire-specific effects (p = 0.0024) and not to increased transmission of one or the other allele of a given heterozygous genotype (p = 0.21). Individual-specific, non-random transmission of homologous chromosomes may provide a mechanism for selection to operate without requiring differential fitness for specific alleles or genotypes in the population as a whole.