Disc mower OBD is used to cut especially feed plants growing horizontally like vetch, white clover, lotus corniculatus and for reaping all kinds of meadow, pasture and feed plants by the efect of air stream provided during rotation of discs. Grass-cutting is performed on sloppy grounds after the machine is made suitable to the slope through the hydraulic piston. The grass that has been cut can be picked according to the desired sizes by the direction changer part that is connected to the rear part of the machine.