1. 1Laboratory of Veterinary Pharmacology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo, Japan
2. 2Department of Endocrine Pharmacology, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
3. 3Zen-noh Embryo Transfer Center, Fukuoka, Fukuoka, Japan
4. 4Research Institute of Agriculture, Tokai University, Kumamoto, Kumamoto, Japan