Distillers dried grains with solubles (DDGS), which are rich in energy and protein, have been used in place of corn and soybean meal in some livestock and poultry feeds,[8] and corn DDGS have become the most popular, economical, and widely available alternative feed ingredient for use in U.S. swine diets in all phases of production. The U.S. Grain Council reported that corn DDGS is used primarily as an energy source in swine diets because it contains approximately the same amount of digestible energy (DE) and metabolizable energy (ME) as corn, although the ME content may be slightly reduced when feeding reduced-oil DDGS.[9] A 2007 study highlighted the recent trends in the use of DDGS, as many producers are including 20% DDGS in diets of swine in all categories. Although 20% is the recommended level of inclusion, some producers are successfully using greater inclusion rates.