The aim of this study was to compare the nutritive values of hays of local sainfoin (Onobrychis sativa) populations these grown in Sivas, Kayseri and Kahramanmaraş provinces of Turkey. For this purpose, 12 different sainfoin populations harvested from these provinces. Sainfoins harvested at flowering stage and dried then chemical compositions, in vitro gas and methane productions, metabolic energy and digestible organic matter contents were determined