青海东部黄牛乳中四种乳蛋白的多态性

Polymorphism of four milk proteins in milk of Qinghai east yellow cattle

采用聚丙烯酰胺凝胶电泳法对 1 4 8头青海东部黄牛乳中四种乳蛋白的多态性进行了研究。结果发现 :①α 乳白蛋白 ,β 乳球蛋白 ,αs1 酪蛋白和 β 酪蛋白都存在多态性 ;②四种乳蛋白的平均有效等位基因数为 1 2 95 4个 ,平均基因杂合度为 0 2 0 1 2 ,平均基因均质度指数为0 65 98;③在青海东部黄牛的αs1 CN基因座上发现一个新的等位基因αs1 CNE 以及罕见等位基因αs1 CND 。

Qinghai east yellow cattle were used to investigate the polymorphism of four milk proteins in the milk by means of polyacrylamide gel electrophoresis The results were as follows:① There was the polymorphism on the loci of four milk proteins including α lactalbumin, β lactoglobulin, α s1 casein and β casein ② The average number of effective alleles, the average gene heterozygosity and the average gene homozygosity index were 1 2954, 0 2012 and 0 6598, resp ③ A new α s1 CN E allele and a rare α s1 CN D allele were discovered in the Qinghai east yellow cattle examined