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Polymorphisms in Caseins of Sheep Milk¹

Utah State University, Logan 84321

Abstract

Starch gel electrophoresis of 592 sheep milk samples including six breeds or crosses between these breeds revealed two variant casein types, one a-s₁ and one ß casein. The number of variants found was low being, .036 and .017 for a_s1-casein and ß-casein types, respectively. The predominant type for a_s1-casein had three brands, whereas, the variant type had six bands. A previously reported a_s1-casein variant was found to be one of the whey proteins as it was absent in reconstituted casein samples subjected to electrophoresis. There were three bands in the ß-casein region of the predominant type. The variant ß-casein type appeared to have a lighter fourth band. The frequency of the ß-casein variant allele was .017. Sheep milk could be typed on gels of low pH with precision equal to that of alkaline gels. Acid gels did not reveal additional heterogeneity.

¹ Published with the approval of the director of Utah Agricultural Experiment Station as Paper No. 1271.

² Department of Dairy Science, Utah State University, Logan.

³ Department of Animal Science, Utah State University, Logan.

⁴ U.S.D.A. Sheep Experiment Station, Dubois, Idaho.

⁵ Utah State Agricultural Experiment Station, Cedar City.