1. Department of Obstetrics, Gynaecology, and Reproduction, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand
2. Swine Reproduction Research Unit, Chulalongkorn University, Bangkok, 10330, Thailand
3. Department of Technology of Farm Management, Faculty of Agro-Industry, Panyapiwat Institute of Management, Nonthaburi 11120, Thailand
4. Adaptation Physiology, Department of Animal Sciences, Wageningen University, Wageningen 6700AH, The Netherlands