Horses don't really need fancy mixtures of food. Find a good pellet, or a low-fat sweet feed (10-12% max). Blue Seal is a great brand of food. Supplement the grain with a multi vitamin, like Accel or Grand Complete. Give them generous hay and water. Alot of horses don't need beet pulp and corn and oats unless they are working 7 days a weeks, competeing in something strenuous like eventing or racing, or are hard keepers (aka super skinny all the time.) Oats and corn are like all carbs. Think of what carbs do to people. They give you energy. You only burn them up when you are working out, otherwise, your body stores them in fat cells. Same goes for horses. Their body wont burn the carbs unless they are working out. They will just store it as stored energy in fat cells, and over weight horses can be in danger of lots of health problems.