The calculations completed under the project have indicated that partial substitution of bean meal for the concentrate provit T did not cause significant changes in daily weight gains. A reduction of provit T in hog fattening to 11% oat units resulted in a drop of average costs of oat unit and costs of weight gain per unit. An introduction of steamed potato silage caused lower weight gains. Potato silage could therefore be used cost effectively in hog fattening only when costs of oat unit in potatoes are similar to costs of oat unit in wheat. However, it would have to be supplemented by bean meal.