1. College of Veterinary Medicine, China Agricultural University, Beijing 100193, People’s Republic of China
2. College of Veterinary Medicine, Northwest A&F University, Shaanxi 712100, People’s Republic of China
3. Foping National Nature Reserve, Shaanxi 723400, People’s Republic of China
4. Beijing Zoo, Beijing 100044, People’s Republic of China
5. College of Animal Science, Zhejiang University, Zhejiang 310058, People’s Republic of China