The aim of this study was to compare the chemical composition, in vitro gas production, metabolizable energy (ME) organic matter digestibility (OMD), relative feed values (RFV) of the cereal forages from maize, sorghum, wheat, barley, oats, rye and triticale. Gas production were determined at 0, 3, 6, 12, 24, 48, 72 and 96 h and their kinetics were described using the equation y=a+b(1-e -ct). There were significant differences among cereal hay in terms of chemical composition (P