Bovine milk was added to yak milk at the ratios from 5 % to 30 %, and whey was prepared using isoelectronic point precipitation method.

• 在牦牛乳中加入5%25-30%25的普通牛乳，采用等电点沉淀法制备乳清，然后用聚丙烯酰胺凝胶电泳分离乳清蛋白。