The CP content of brewers grains is approximately twice as high as foun- dation grains because of the removal of most soluble carbohydrate fractions and the relative proportions of carbohydrate initially present in foundation grains. The average CP content of brewers grains ranges from 21% to 29% CP/DM (Tables 3–7), with the variation existing in all sources of grains (eg, different regions of the United States, among wet and dry grains, commercial and microbrewery grains). Earlier reports [2,3,9] listed brewers grains containing as 23% to 25% CP/DM. Many recent data (Tables 3, 4, and 6) list brewers grains as containing 29% to 33% CP/DM. This increase in CP content could be due to improved varieties of barley, corn, and rice being used as foundation grains, different brewing methods, or changes in the recovery or pooling of wastes generated during the brewing process (Fig. 1).