1. College of Animal Science and Technology, Northwest A and F University, Yangling, China
2. Yangling Vocational and Technical College, Yangling, China
3. 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, China
4. National Beef Cattle Improvement Center, Yangling, China