1. Department of Obstetrics, Gynaecology and Reproduction Faculty of Veterinary Science Chulalongkorn University Bangkok Thailand
2. Swine Research Unit Faculty of Veterinary Science Chulalongkorn University Bangkok Thailand
3. Department of Physiology Faculty of Veterinary Science Chulalongkorn University Bangkok Thailand
4. Division of Functional and Developmental Science of Livestock Production Graduate School of Agriculture Tohoku University Sendai Japan