affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Jiangxi Academy of Agricultural Sciences, South China Agricultural University, affiliation not provided to SSRN, South China Agricultural University, South China Agricultural University, South China Agricultural University, affiliation not provided to SSRN, South China Agricultural University - College of Animal Science and South China Agricultural University - Guangdong Province Key Laboratory of Animal Nutritional Regulation