1. Department of Subtropical Agro-Production Sciences, Faculty of Agriculture, University of the Ryukyus
2. Department of Veterinary Science, Faculty of Agriculture, Kagoshima University
3. Soo Livestock Hygiene Service Center
4. Department of Bioproduction, Faculty of Agriculture, University of the Ryukyus
5. Department of Subtropical Agro-Environmental Sciences, Faculty of Agriculture, University of the Ryukyus