1. College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, China
2. Laboratory of Animal Nutrition Physiology and Metabolism, The Chinese Academy of Sciences, The Institute of Subtropical Agriculture, Changsha 410128, China
3. Center of Ningxiang Animal Husbandry and Fishery Affairs, Ningxiang 410625, China
4. College of Animal Science and Technology, China Agricultural University, Beijing 100091, China