甘肃黑白花奶牛α－乳清蛋白及β－乳球蛋白多态性的研究

Polymorphisms of α-Lactalbumin and β-Lactoglobulinin Gansu Black-and-White Dairy Cattle

在评述奶牛α－乳清蛋白（α－Ｌａ）及β－乳球蛋白（β－Ｌｇ）遗传多态性研究进展的基础上，作者采用聚丙烯酰胺凝胶电泳法，对来自３个奶牛场的１７９头甘肃黑白花奶牛、６０头西德黑白花奶牛及６０头美系黑白花奶牛乳样中α－Ｌａ及β－Ｌｇ的多态性作了分析。结果发现甘肃黑白花奶牛同美系、德系黑白花奶牛一样，在这两个基因座上均只有Ａ和Ｂ两个常染色体共显性等位基因；相比之下，其基因频率更接近于美系黑白花奶牛。

The polymorphisms of α-lactalbumin(α-La)and β-lactoglobulin(β-Lg)in 179 Gansu black-and-white dairy cattle(GBC), which was mainly formed by F5 or F6 hybrids of Holsteinftom USA ×native yellow cattle, 60 Holsteins imported from USA and 60 Holsteins from Germanyheve been studied by using PAGE method. It was found that tnere were two alelles,A or B, on bothα-La and β-Lg loci in the GBC,which were the same with the results of the Holsteins both from USAand Germany. The genetic distance between GBC and Holsteir from USA was 0. 0328 ,between GBCand Holstein from Germany was 0. 1970.