1. China National Engineering Research Center of JUNCAO Technology, Fujian Agriculture and Forestry University, Fuzhou, China
2. Department of Animal Husbandry and Veterinary, Chengdu Agricultural College, Chengdu, China
3. College of Animal Science, South China Agricultural University, Guangzhou, China
4. College of Animal Science, Fujian Agriculture and Forestry University, Fuzhou, China