[jjotto]

The ‘spent grain’ is called DDGS and there is a worldwide market for it as animal feed.

http://www.grains.org/buyingselling/ddgs

[null and void]

Oh yes, of course, spent grain is rich in proteins and vitamins, it is a wonderful animal feed (side note, my favorite bread is "Icky" bread, made from the spent grains from The Great Basin Brewing Company's Ichthyosaur IPA).

BUT US law regards the grain from alcohol fuel production as "industrial waste" and forbids its use as an animal feed.

So ranchers, feed lot operators chicken and pig farmers have to buy their feed grain from corn farmers, the corn growers know it's nice to have a strong lobby...