A recent study aims to address the mystery surrounding the low milk production and fat content in dairy from Southeast Asian countries, particularly Thailand and Vietnam, by focusing on the fermentable organic matter (FOM) content of tropical forages. The study was conducted due to the lack of data on FOM in these regions and seeks to provide solutions to improve milk production and quality. The research utilized innovative testing methods, including an in vitro automated gas production test and the nylon bag technique, to evaluate the FOM content of common tropical grasses in Southeast Asia. Additionally, the study suggested strategies for enhancing harvest times and formulating dairy cow diets to optimize milk production and fat content, offering promising insights for improving dairy farming efficiency and productivity in the target countries.