The present invention relates to an enzymatic composition comprising a main substrate, selected from the group made up of a wheat, a wheat bran, a rapeseed oil cake and a mixture thereof, fermented with a strain of Aspergillus, section Nigri, said enzymatic composition having: (i) xylanase activity no lower than 500 AXC per gramme of composition, (ii) β-glucanase activity no lower than 500 BGU per gramme of composition, and (iii) cellulase activity no lower than 50 CMC per gramme of composition; as well as the use thereof in the feed of ruminants.