Mitigating, or abating, greenhouse gases (GHG) from livestock systems can play a vital role in providing solutions to the UK’s climate change obligations. The main abatement options from the livestock sector, independent of grazing/pasture management, are through the efficiencies with which ruminant animals utilise their diet and manure management. Options include breed selection, through manipulation of dietary regimes or manure storage strategies. Attempts to abate GHG emissions should first target those abatement options that are cost efficient and this study estimates the cost effectiveness of selected options for the UK livestock sector.