1. Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Chengdu, China;
2. Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Sichuan Province, Chengdu, China;
3. College of Life Science and Technique, Southwest Minzu University, Chengdu, China;
4. College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, China