Quantifying H2 emissions under different nutritional mitigation strategies and its impact on improving the prediction of enteric methane emissions of ruminants

•Proportion of concentrate, lipids, inhibitors and electron acceptors decrease methanogenesis.•Hydrogen production improve methane production models.•Hydrogen production slope depends on the mitigation strategy and its mechanism of action.•Hydrogen slope is negative with inhibitors or electron acceptors.•Hydrogen slope is positive with proportion of concentrate and lipids.