1. School of Life Science and Technology, Southwest Minzu University, Chengdu, P.R. China;
2. Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu UniversityChengdu, Sichuan, P.R. China;
3. Key Laboratory of Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation, Chengdu, Sichuan, P.R. China