A mobile feed mixer comprises a platform; mounted next to each other on the platform a trough-like blending hopper with a screw and a gate flap for unloading the feed, and dosing hoppers each configured with a pipe in the side wall thereof, each pipe being inserted with a clearance fit into an opening in the side wall of the blending hopper, said side wall facing the dosing hoppers and being vertically oriented, and with a screw inserted in the pipe for feeding the contents of the dosing hopper into the blending hopper; and a weight-measuring device for taking weight measurements of the contents of the blending hopper.
