An apparatus for the cutting and mixing of fibrous products for the preparation of animal feed which includes a hopper where equipments for the cutting and mixing of fibrous product are installed. Based on this invention, such mixing and cutting equipment is constituted by one auger that is separated into two equal (welded) sections by a partition that is attached to the shaft of the auger itself. The auger is equipped with a first section of auger blades that turn clockwise and a second section of auger blades that turn counterclockwise. The hopper has a bottom that is partially cylindrical where the auger is installed and one wall extends vertical and the opposite one extends oblique from the bottom.