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The Journal of Heredity 1998:89(1)
© 1998 The American Genetic Association 89:104-106

Brief communication. Tobiano spotting pattern in horses: linkage of To with AIA and linkage disequilibrium

DA Duffield, and PL Goldie

In a study of 2,786 tobiano and non-tobiano horses involved in paint horse breeding programs throughout the United States, the inheritance of the tobiano color pattern gene was tracked in pedigrees using the tightly linked polymorphic albumin gene. The dominant tobiano allele (To), which produces the tobiano spotting pattern in horses, was in coupling with both AIA and AIB alleles at the albumin locus. The frequency of the To:AIA linkage phase, among all the homozygous tobiano horses in this study including offspring and parents (N = 127), was 0.08. The To:AIB linkage phase was the most frequent (0.92). Linkage disequilibrium exists between the tobiano and albumin loci. The linkage disequilibrium parameter (D was calculated as D = 0.056 at 79% of maximum linkage disequilibrium.


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