The PCR-SSCP products of primer showed polymorphisms and could be divided into four genotypes: AA,AB,AC,CC among 70 Jersey and Holstein cows.

• 供试的70头娟姗牛和荷斯坦奶牛共发现4种基因型；分别为AA型、BB型、AB型和AC型；卡方检验奶牛在该位点基因频率差异极显著(P<0.；01)；未达到Hardy Weinberg平衡。