1. College of Food Science and Technology, Hunan Agricultural University, Changsha, China;
2. Research Department of Animal Nutrition and Poultry, Hunan Institute of Animal and Veterinary Science, Changsha, China;
3. Institute of Bast Fiber Crops Chinese Academy of Agricultural Sciences, Changsha, China;
4. College of Animal Science and Technology, Hunan Agricultural University, Changsha, China