Improving greenhouse gas emissions intensities of subtropical and tropical beef farming systems using Leucaena leucocephala

A scenario allowing animals pastured on Rhodes grass to be supplemented with urea was examined to compare the leucaena ‘early finishing’ enterprise with a similar enterprise utilising a C4 grass system with higher nitrogen supply. The aim of this simulation was primarily to compare the effects of nitrogen supplementation on the whole farm GHG emissions profile, but also to assess the potential economic impacts of supplementing cattle with urea.