Beauchemin and McGinn (2005) reported 2.81 and 4.03% of GE losses and emissions of 9.2 and 13.1 g CH4/kg DMI from corn and barley based fi nishing cattle diets. Sheep have been reported to lose 4.6 and 3.6% of GE as CH4 when grazing pastures with 75% and 81% DM digestibility, respectively (Lassey et al., 1997; Judd et al., 1999).