1. College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
2. College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, China
3. Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, Qinghai 810008, China