AMY was monomorphic in Small tailed Han sheep, Tan sheep, Gansu Alpine Merino and was polymorphisms in Qinghai Merino, Tibetan sheep in Gasu, Tibetan sheep in Qinghai.

• AMY在小尾寒羊、甘肃高山细毛羊、滩羊中呈单态，在青海细毛羊、青海藏羊、甘肃藏羊中存在多态性；