How about succotash? From the Welter Seed and Honey webpage:
Succotash is a mix of 1/3 early wheat, 1/3 barley and 1/3 medium maturing oats. For the livestock farmer this will give more pounds per acre than if each were planted separately. Succotash gives much more feed value to the acre than straight oats. It runs very high in protein. Many farmers like it for hog or calf feed.