1. Department of Animal Resources Science, Dankook University, Cheonan 330-714, Republic of Korea
2. Institute of Animal Molecular Biotechnology and Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
3. Department of Biomedical Sciences, Catholic Kwandong University, Gangneung 25601, Republic of Korea
4. Center for Animal Biotechnology and Genomics and Department of Animal Science, Texas A&M University, College Station 77843-2471