The differences in exon 2 of MTNR1A gene between Small Tail Han sheep and Dorset sheep consisted of five nucleotide changes (C329T, G355T, C566T, C580A and A675G), and homology of nucleotide sequence was 99.4%.

• 小尾寒羊与多赛特羊MTNR1A基因外显子2的差异由5个变化的核苷酸(分别为C329T、G355T、C566T、C580A和A675G)组成；核苷酸同源性为99.；4%25。