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Ethanol Production and Co-Products

While ethanol is showing real promise towards becoming a renewable, sustainable energy supply, the co-products of ethanol production have equally exciting implications. Ethanol production results in more than just a renewable fuel source, and the co-products have just as far reaching implications. Ethanol production creates distillers dried grains with solubles (DDGS), a high-protein, high-energy livestock feed. Used by beef and dairy cattle, swine, and poultry producers, DDGS is a quality source of protein in feed rations.

DDGS is an ample co-product of ethanol production. A bushel of corn used in the dry grind ethanol process yields 2.8 gallons of ethanol, 17 pounds of carbon dioxide, and 16 pounds of distillers grains. And with more than 12 millions metric tons of distillers grains being produced in 2006, the effect on the feed market is immense. Nearly 90% of distillers grains are sold into domestic feed markets, and the international market is growing fast.

But what makes DDGS so desirable? The nutrients in corn are concentrated by a factor of three in distillers grains after the dry grind ethanol process, creating a highly nutritious feed. Distillers grains are well suited to ruminant animal diets, so the largest consumers of DDGS are dairy cattle (consisting of 46% of market consumption), followed by beef cattle (42%), swine (9%), and poultry (3%).
And as industry researchers strive to refine inclusion rates to improve nutritional quality, it is expected for the use of DDGS to rise.

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