1. Department of Veterinary Physiology, Faculty of Agriculture, University of Miyazaki, 1-1, Gakuenkibanadainishi, Miyazaki-shi, Miyazaki 889-2192, Japan
2. Department of Veterinary Anatomy, Faculty of Agriculture, University of Miyazaki, 1-1, Gakuenkibanadainishi, Miyazaki-shi, Miyazaki 889-2192, Japan
3. Department of Veterinary Domestic animal Hygienics, Faculty of Agriculture, 1-1, Gakuenkibanadainishi, Miyazaki-shi, Miyazaki 889-2192, Japan