1. School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5201, Japan
2. Faculty of Agriculture, University of Miyazaki, 1–1 Gakuen Kibanadai-nishi, Miyazaki-shi, Miyazaki 889-2192, Japan
3. Clinic for Ruminants, Vetsuisse Faculty, University of Bern, Bern 3001, Switzerland