HeuBoy feed ball - also for group housing The game ball offers your animals optimal variety The HeuBoy is ideal for use in the stable, on the pasture or in the paddock. The calves can pluck the hay from 19 feeding openings, each 70 mm in diameter, and are so busy. The stable, UV-resistant plastic can be filled with up to 3 kg of hay. Filling is possible via the 116 mm filling opening with screw cap. The HeuBoy can also be hung on a rope or a chain; the calves like to deal with the swinging ball.