1. Department of Hygiene Service, Himeji Livestock Hygiene Service Center, 2-10-16, Tadera-higashi, Himeji, Hyogo 670-0081, Japan
2. Animal Husbandry Department, Hokubu Agricultural Technology Institute, Hyogo Prefectural Technology Center for Agriculture, Forestry and Fisheries, 123, Yasui, Wadayama, Asago, Hyogo 669-5254, Japan