Abstract
Milk epithelial mucin (MUCI) of yaks was separated by SDS–polyacrylamide gel electrophoresis. Atotal of nine types of MUCI were revealed in 427 yaks from five yak breeds including Maiwa yak, Jiulong yak, Tianzhu white yak, Qinghai yak and Tibetan yak. The molecular weights of MUCI are from 163 kD to 208 kD, most of which are larger than those of bovine. Population genetic analysis shows that the gene frequency and genotype frequency of yak MUCI differ among breeds, with relatively high gene heterozygosity. The five yak breeds studied fall into two groups according to their milk MUCI gene frequency, suggesting that milk MUCI exhibits specificities for local yak groups.
* Supported by National Natural Science Foundation of China MUCI and New Century Excellent Talents in University (NCET–04–0135)
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* Supported by National Natural Science Foundation of China MUCI and New Century Excellent Talents in University (NCET–04–0135)