The TMR contained 547g/kg DM, 164g/kg crude protein (CP), 62g/kg ether extract, 322g/kg neutral detergent fibre (i.e., aNDFom) and 120g/kg starch. The DM intake was numerically (i.e., P=0.13) lower with EO feeding (i.e., 26.0 versus 27.4kg/d) but milk yield was not impacted (mean 49.2kg/d). However milk fat production (1.63 versus 1.66kg/d; P=0.02) and milk fat proportion (33.2 versus 33.9g/kg; P