The invention concerns a machine for the mechanical treatment of cereals (16) in grains for the animal feeding, comprising:- A frame (2)- A first toothed roller (3A) and a second toothed roller (3B), rotating around corresponding axes (X1,X2), mutually engaging and co-operating to mechanically treat said cereals (16) in grains, said first and said second toothed rollers (3A,3B) defining an input region (I1) for the input of said cereals in grains (16) and an output region (12) for the output of the treated cereals (16)- A motorization connected to at least one between said first and second toothed rollers (3A) to drive the toothed rollers (3A,3B) into rotation,Said machine (1) being characterised in that it comprises, in combination:- A wedge-shaped element (5) presenting a first (51) and a second (52) surface forming the wedge and facing respectively said first toothed roller (3A) and said second toothed roller (3B), defining in such a way a first feed channel (C1) and a second feed channel (C2) of the cereals (16) in correspondence of said input region (I1)- Means (6) for adjustment of the relevant position of said wedge-shaped element (5) with respect to said first toothed roller (3A) and said second toothed roller (3B), mechanically connected to the wedge-shaped element (5) or to said first and second toothed rollers (3A,3B) and operable by a user to allow the adjustment of the relative position of the wedge-shaped element (5) with respect to said first and second toothed rollers (3A,3B), so as to adjust the widths (d1, d2) of said first and second feed channels (C1,C2).
