Mixing Wagon

A mixer feeder comprising a mobile chassis, a tub provided on the chassis and at least one auger provided for rotation about a respective vertical axis of rotation in the tub, wherein, seen in top view, the tub has opposing semi-circular ends, and wherein, seen in vertical cross-section, the wall of the tub extends at least substantially upright from the bottom of the tub, characterised in that the tub wall curves inward at the upper side of the tub, seen in top view, over the entire circumference of the tub at the upper side thereof, sloping up and then extending downward forming an upside-down gutter for reducing the risk of material subjected to the operation of the augers unintentionally moving out of the tub, the downwardly extending portion and the upward sloping portion joining each other via a bend.