I have been using it for the last 5 years. It is high in protien and phosphorus. Don't add additoinal protien, make sure you keep that in check. Also, watch your phosphorus levels, there is a special co product mineral made by most feed companies that has low phosphorus and high calcium. It is cheaper that the regular mineral as well. Gluten also contains quite abit of energy. Rations would vary for dry cows, lactating cows, growing feeder calves or finishing cattle. Ususally protien percentages in the ration are the limiting factor in how much is used.