Mitavite? Extru? Grains: Provide effective, safe feed-room options. Corn has long been used as an energy source in horse feeds. In its raw form it is poorly digested and when cracked, it oxidises quickly resulting in reduced nutritional value. Mitavite? steam-extruded Extru? Corn is palatable, highly digestible and locks in the nutritional value for longer. Also available in Mitavite? bulka bags.