1. College of Animal Science and Technology, Northwest A&F University, No. 22 Xinong Road, Yangling 712100, China
2. College of Grassland Agriculture, Northwest A&F University, Yangling 712100, China
3. National Beef Cattle Improvement Center, Yangling 712100, China
4. Guangdong Provincial Key Laboratory of Food Quality and Safety/Nation-Local Joint Engineering Research Center for Machining and Safety of Livestock and Poultry Products, South China Agricultural University, Guangzhou 510642, China