Fig. 2

NJ tree of the Hetian Gray donkey and other studied donkey breeds. YN indicates Yunnan donkeys; HT, Hetian Gray donkeys; DZ, Dezhou donkeys; GL, Guangling donkeys; GZ, Guanzhong donkeys; XJ, Xinjiang donkeys; HBH, Huaibei Gray donkeys; kiang, Equus kiang; somali, Equus africanus somaliensis