Polymorphism of AA-NAT gene and its relationship with litter size of Jining Grey goat of China

1 Key Laboratory of Farm Animal Genetic Resources and Germplasm Innovation of Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China 2 Bioengineering College, Chongqing University, Chongqing 400030, China 3 Animal Science Institute, Xinjiang Academy of Animal Sciences, Urumqi 830000, China 4 State Key Laboratory of Agricultural Biotechnology (China Agricultural University), Beijing 100193, China