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Milk protein polymorphisms were genotyped by polyacrylamide gel electrophoresis (PAGE) from 109 Maiwa and 100 Jiulong yaks. The relationships between milk protein polymorphisms and 3 milking traits were studied. The results showed that β- CN,κ-CN and α-La were monomorphic, and αs1-CN and β-Lg were polymorphic, with αs1-CN D and β-Lg E as dominant genes, respectively. The frequencies of αs1-CN D were 0.8073 and 0.6000 in two populations and β-Lg E were 0.9770 and 0.9700. The mean heterozygosities were 0.1021 and 0.1867 in the two populations. No significant effects on milking traits and milk protein compositions were observed except for αs1-CN locus on fat percentage in Jiulong yak. (Asian-Aust. J. Anim. Sci. 2004. Vol 17, No. 11 : 1479-1483)

Genetic Polymorphism of Milk Protein and Their Relationships with Milking Traits in Chinese Yak