1. United Graduate School of Agricultural Science, Gifu University, Gifu 501-1193, Japan
2. Livestock Breeding and Veterinary Department, Ministry of Agriculture, Livestock and Irrigation, Naypyidaw, Myanmar
3. Faculty of Applied Biological Sciences, Gifu University, Gifu 501-1193, Japan
4. Laboratory of Comparative Endocrinology, Department of Biology, KU Leuven, Leuven B-3000, Belgium