1. Department of Biotechnology, MingDao University, ChangHua 523, Taiwan
2. Department of Animal Science, National Chung Hsing University, Taichung 402, Taiwan
3. Institute of Molecular Biology, National Chung Hsing University, Taichung 402, Taiwan
4. Livestock Research Institute, Council of Agriculture, Tainan 712, Taiwan
5. Institute of Biomedical Sciences, Academia Sinica, Taipei 115, Taiwan