The aim of this work was to develop and evaluate aeration as a strategy to reduce methane emissions during the storage of cattle slurry. For this purpose, a laboratory pilot including 3 storage reactors (9 litres each) was developed. One of them was equipped with an oxydo-reduction potential (ORP) probe in order to control aeration level. Methane (CH4) and ammonia (NH3) emissions were determined during all experiments. Aerobic storage with low level of aeration allow to reduce CH4 emissions during storage (>85%). However, NH3 emissions are promoted by aeration and the level of aeration should be minimized.