Acknowledgements
The authors would like to express their most sincere thanks to all who have assisted and supported the research in this study, particularly the Tropical Feed Resources Research and Development Center (TROFREC), Department of Animal Science, Faculty of Agriculture, Khon Kaen University, Khon Kaen, Thailand, the Royal Golden Jubilee Ph. D. Scholarship Program, and Dairy Farming Promotion Organization of Thailand (DPO), Northeast Region, for their active collaborations and support.