Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Genetic Polymorphism of Milk Protein and Their Relationships with Milking Traits in Chinese Yak

  • Mao, Y.J. (Animal Science and Technology College, Yangzhou University) ;
  • Zhong, G.H. (Life Science and Technology College, Southwest Nationalities University) ;
  • Zheng, Y.C. (Life Science and Technology College, Southwest Nationalities University) ;
  • Pen, X.W. (Institute of Animal Science and Veterinary Medicine HAAS) ;
  • Yang, Z.P. (Animal Science and Technology College, Yangzhou University) ;
  • Wang, Y. (Life Science and Technology College, Southwest Nationalities University) ;
  • Jiang, M.F. (Life Science and Technology College, Southwest Nationalities University)
  • Received : 2004.01.29
  • Accepted : 2004.06.07
  • Published : 2004.11.01
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Abstract

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 $\beta$-CN, $\kappa$-CN and $\alpha$-La were monomorphic, and ${\alpha}_{s1}$-CN and $\beta$-Lg were polymorphic, with ${\alpha}_{s1}$-CN D and $\beta$-Lg E as dominant genes, respectively. The frequencies of ${\alpha}_{s1}$-CN D were 0.8073 and 0.6000 in two populations and $\beta$-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 ${\alpha}_{s1}$-CN locus on fat percentage in Jiulong yak.

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References

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