1 Division of Animal Science and Resources, College of Life Science and Natural Resources, Sangji University, 660 Usnadong, Wonju, Gangwondo, 220-702, Republic of Korea.
2 Theragen Etex Bio Institute, Theragen Etex, Suwon, 443-270, Republic of Korea.
3 Division of Animal Science and Resources, College of Life Science and Natural Resources, Sangji University, 660 Usnadong, Wonju, Gangwondo, 220-702, Republic of Korea. erchung@sangji.ac.kr.