1. Laboratory of Veterinary Pharmacology, School of Veterinary Medicine Azabu University 1‐17‐71 Fuchinobe, Chuo‐ku Sagamihara‐shi Kanagawa 252‐5201 Japan
2. Bioalchemis 3‐28‐61 Honshuku‐cho, Fuchu‐shi Tokyo 183‐0032 Japan
3. Japan SLC, Inc 85 Ohara‐cho, Kita‐ku, Hamamatsu‐shi Shizuoka 433‐8102 Japan
4. Institute of Food Research National Agriculture and Food Research Organization (NARO) 2‐1‐12 Kannondai, Tsukuba Ibaraki 305‐8642 Japan