These byproducts of milling wheat for flour consist of varying amounts of bran, germ and flour. They are highly palatable, low in calcium and tend to be higher in phosphorus than most other grains and processed grain by-products. Wheat bran is highest in fiber and phosphorus and lowest in energy of the five. It can be included in the grain mix up to a level of 25 percent or fed at a rate of up to 3.2 kg  per cow per day.