1. Department of Animal Science and Technology, National Taiwan University, No. 50 Lane 155 Sec. 3 Keelung Road, Taipei 106, Taiwan
2. Kaohsiung Animal Propagation Station, Livestock Research Institute, Council of Agriculture, Kaohsiung, Taiwan
3. Department of Mechanical Engineering, Tungnan University, Taipei 222, Taiwan
4. Livestock Research Institute, Council of Agriculture, Tainan, Taiwan
5. Center for Biotechnology, National Taiwan University, No. 81, Changxing, Taipei 106, Taiwan