Growth in corn dry-mill ethanol production has surged in the past several years, simultaneously creating a co-product -- distillers' grains (DDGS). Many in the U.S. feed industry were concerned about the size of this new feed source and whether it could be used entirely by the feed industry, but they also worried about the price discovery process for the product. This book provides an overview of the methodology used to estimate the U.S. supply and consumption of DDGS. Potential domestic and export use of U.S. DDGS exceeds current production and is likely to exceed future production as ethanol production continues to grow. This book discusses the DDGS price discovery process along with the price relationships of distillers' grains, corn, and soy-bean meal.