Two genotypes (AA and AB) were detected in both sheep breeds. In Small Tail Han sheep and Dorset sheep, frequency of genotype AA was 0.638 and 0.800, frequency of genotype AB was 0.362 and 0.200, respectively.

• 统计结果表明；小尾寒羊和多赛特羊AA基因型频率分别为0.；638和0