1. Laboratory of Animal Nutritional Physiology and Metabolic Process, Key Laboratory of Agro-ecological Processes in Subtropical Region, National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan, China
2. College of Animal Science and Technology, Hunan Agricultural University, Changsha, Hunan, China
3. University of Chinese Academy of Sciences, Beijing, China
4. Department of Nutrition, University of California, Davis, California, USA
5. College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China