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