1. State Key Laboratory of Animal Nutrition, China Agricultural University, Beijing, China.
2. State Key Laboratory of AgroBiotechnology, China Agricultural University, Beijing, China.
3. Center for Animal Biotechnology and Genomics, Texas A&M University, College Station, Texas.
4. Department of Veterinary Pathobiology, Texas A&M University, College Station, Texas.
5. Department of Molecular and Cellular Medicine, Texas A&M University, College Station, Texas.
6. Department of Animal Science, Texas A&M University, College Station, Texas.