This grazing study demonstrated that canola oil sprayed on grazed herbage had effective mitigation effect on CH4 emission from cattle. Oil supplementation promoted an increase in feed intake, hence further reducing CH4 yield (emissions per unit of feed intake). At present, however, oil spraying of grazed pasture cannot be recommended as a cost-effective method of CH4 emission mitigation. Nevertheless, using oil as carrier of anti-methanogen (and anti-bloat) agents, currently under development, may constitute an effective means of sustained delivery of these agents, closely matching the intake rates of the grazed herbage. If lipids mitigation effects on CH4 emission from grazed ruminants are confirmed by longer-term studies, breeding forages for enhanced lipids contents may be a promising pathway to improve feeding value of forages as well as reduction of environmental impact (greenhouse gas emission) of pastoral livestock farming.