In the USA corn supply is increasingly being fed to the ethanol industry, which could very well create a battle between the livestock industry and the ethanol industry. The increased production of ethanol results in increased corn price, increased corn acreage, decreased corn exports, and increased feed use of ethanol by-products (DDGS). DDGS is high in energy and can be a good partial substitute for corn in swine diets. The high digestibility of phosphorus works well with the fact that there is less heat damage to DDGS, which increases lysine digestibility. It is thought that DDGS may improve gut health, and sows fed DDGS weaned more pigs per litter and the pigs had a slightly improved growth rate. However, DDGS does have some limitations. Because of the high fibre content and low liquid content, manure output increases slightly. Because they are 10% corn oil, carcass quality decreases. Feeding DDGS could potentially reduce palatability, feed intake, and growth rate. Studies are currently being done on other ethanol by-product uses.