A large amount of different corn co-products is produced every year. Corn kernels are refined either by wet milling or dry-grind processing. Corn gluten feed is a co-product of the wet milling process in which starch is converted to sweetener (fructose). Approximately, 24% of the original grain is recovered as gluten feed, and this contains mainly corn bran and corn steep liquor. Its high content on digestible fiber and protein makes corn gluten feed a valuable energy and protein source for lactating dairy cows.