Enzymatic and metabolic activities of four anaerobic sludges and their impact on methane production from ensiled sorghum forage

•Xylanase was the prevailing enzymatic activity for all inocula.•Xylanase activity exhibited its maximum activity earlier than esoglucanase.•The inoculum type influenced methane production rates but not methane potentials.•Correlations between enzymatic activities and methane production rates were f...

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