The waste products from processed potatoes are a disposal problem for the processors but a valuable source of feed for the livestock industry. Culls potatoes and, in some years, surplus production of potatoes are a source of high-energy feed. All potato products are an excellent source of energy for ruminant animals. Rations high in potato content must be supplemented with protein, minerals, vitamins and a fiber source. Therefore in order to get as much dry matter from potatoes as from grain you would have to have 450 pounds of potatoes to equal 100 pounds of grain.
Potatoes are primarily a source of energy.
They are relatively low in minerals, particularly calcium and phosphorus. Canadian scientists observed that potato pulp or meal that was dehydrated at high temperatures had practically no digestible protein. Potatoes are better suited for cows or yearlings than they are for calves. E. When supplements are formulated for rations containing high levels of potatoes, the amount of vitamins present in potatoes can be ignored and the total daily requirement provided by the roughage or supplement part of the ration. Potatoes are practically devoid of fiber.