1. Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100, Thailand
2. Research Center of Producing and Development of Products and Innovations for Animal Health and Production, Chiang Mai University, Chiang Mai 50100, Thailand
3. Department of Animal Sciences, Wageningen University, 6700 AH Wageningen, The Netherlands
4. Akkhraratchakumari Veterinary College, Walailak University, Nakhon Si Thammarat 80160, Thailand
5. Cambodia Campus, Asian Satellite Campuses Institute, Nagoya University, Nagoya 464-8601, Japan