Corn DDGS 35% is a by-product of the alcohol industry. It is obtained in the production of bioethanol, which is used as a fuel additive. It can also be a partial replacement for soy flour or other protein sources. Soluble Dehydrated Grains (DDGS) are a nutrient-rich by-product of ethanol production. Corn DDGS is both an energy and protein supplement. Corn DDGS DDGS contains 35% protein, in some batches up to 37%, which is significantly higher than most manufacturers.