Corn Gluten Feed
Corn gluten feed is the highest volume co-product of the wet corn milling industry and is a popular feedlot cattle protein and energy source because it is an intermediate protein product that is rich in highly-digestible fiber. Dry corn gluten feed is often pelleted and marketed to domestic and European dairy industry. Corn gluten feed actually contains no gluten, but a mixture of corn bran and condensed steepwater solubles; it may also contain corn germ meal, as well as other co-product streams from the plant. Corn gluten feed can vary in composition due to the ration of condensed distillers solubles to corn bran. This will vary from plant to plant, depending on the markets available. Corn gluten feed that is higher in bran will be lower in protein, phosphorous, and sulfur.
Corn Gluten Meal
Corn gluten meal is golden-yellow and is mainly gluten, the high protein portion of the corn kernel. Corn gluten meal is used primarily in the swine and poultry industries and is high in xanthophyl, a yellow pigment. Corn gluten meal is a high bypass protein source. Although expensive, it may be useful in beef diets that require bypass protein, such as those for lightweight calves.
Condensed Steepwater Solubles
Condensed steepwater solubles are an excellent source of soluble protein for liquid beef supplements. Most condensed steepwater solubles are used in corn gluten feed, but because condensed steepwater solubles have the consistency of molasses, they can also be used in liquid supplements. Condensed steepwater solubles are about 35% protein and can be extremely high in phosphorous and sulfur. In 1999, the wet corn milling industry used 1.4 billion bushels of corn (14.8% of the U.S. supply). Wet milling yields 31.5 pounds of starch with corn being processed into 33 pounds of sweetener or 2.5 gallons of ethanol. Also, 13.5 pounds of gluten feed, 2.5 pounds of gluten meal, and 1.6 pounds of corn oil are produced. In 2000, 10.6 billion pounds of corn gluten feed and corn germ meal were produced.
http://www.ethanol-information.com/