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New C-band polymorphism in the White Park cattle of Great Britain.

A chromosome analysis, using G- and sequential Q- and C-banding, of 133 cattle distributed among seven rare breeds of cattle in Great Britain, showed a new C-band polymorphism of chromosome 27. The polymorphism was demonstrated by the absence of a centromeric block of heterochromatin and was only seen in the White Park breed. The polymorphic chromosome had a frequency of 0.446 and was present in either a heterozygous or homozygous state in 75 percent of the White Park cattle studied. The animals carrying the polymorphic chromosome have been traced back to three bulls, two of which have been widely used throughout the breed. It seems likely that the polymorphism arose in one common ancestor before 1949.