1. Department of Animal Science, National Taiwan University, Taipei 106, Taiwan, R.O.C.
2. Department of Veterinary Medicine, Taipei 106, Taiwan, R.O.C.
3. Hsinchu Station, Taiwan Livestock Research Institute, Hsinchu, Taiwan, R.O.C.
4. Chung-Yu Junior College of Business Administration, Keelung, Taiwan, R.O.C.