AbstractFour experiments were carried out to evaluate effluent from grass silage as a feed for beef cattle. Castrated male cattle (steers) with mean initial live weights of 380,460 and 400 kg in Experiments 1–3 were offered effluent, in addition to a diet of grass silage givenad libitumand supplemented with cereal‐based concentrates. The cattle readily consumed effluent in preference to fresh water, the mean intake over the three experiments being 12·71 per head daily containing 0·77 kg dry matter (DM). Supplementation with effluent did not affect silage DM intake and increased total DM intake by 10%. Digestible energy concentrations of 13·1 and 16·6 MJ kg‐‐1DM and organic matter, respectively, were determined for effluent in Experiment 4. There were no problems of ill health in any of the 69 cattle which were offered effluent. It is concluded that fresh or well‐preserved stored effluent from grass silage is readily consumed by beef cattle, is of high nutritive value and could enable savings to be made in tot