Grains are seeds that reproduce if planted.
Milling is the process of separating these three components and of grinding the endosperm to small particles called flour. Intermediate-size particles known by such names as meal, farina, semolina, and grits may also be made if desired. The flour-producing endosperm usually makes up about 75 to 80 percent of the kernel weight. The bran portion , also called mill feed, is sold mainly as an ingredient for cattle and sheep feeds, but has become important again since poeple realize the importance of fiber in a healthy diet. The amount of germ in cereal grains varies from less than 2 percent in wheat to more than 10 percent in corn.