It must contain no more than 4 percent of foreign material. Corn gluten meal is the by-product of the manufacture of corn syrup or starch. It is made up of the dried residue after the bran, germ and starch have been removed, and is a high-quality protein. Brewers rice is small fragments of rice kernels that have been separated from larger kernels of milled rice. Brown rice is the unpolished rice left over after the kernels have been removed.
Soybean meal is a by-product of the production of soybean oil and is high in protein.
Ground grain sorghum is made by grinding the grains of sorghum. Cereal food fines is a by-product of breakfast cereal production, consisting of particles of the foods. Linseed meal is the residue of flaxseed oil production, ground into a meal. Peanut hulls are the outer hull of the peanut shell, ground. Dried kelp is dried seaweed.