1. Japan Farm Co., Ltd., 651 Masumaru, Osaki-cho, So-gun, Kagoshima 899–7303, Japan
2. The Chemo-Sero-Therapeutic Research Institute, Kikuchi Research Center, 1314–1 Kawabe Kyokushi, Kikuchi, Kumamoto 869–1298, Japan
3. Department of Veterinary Medicine, Joint Faculty of Veterinary Medicine, Kagoshima University, 1–21–24 Korimoto, Kagoshima 890–0065, Japan