What kind of damage / reaction? That's interesting that it would be from making ethanol. Isn't corn used to produce ethanol? I wonder what would be the difference.
It was in the Waterfowl World column in The Poultry Press. All I've got is that it causes ducks to waste away in spite of being well fed. A necropsy done at Penn State University showed kidney failure. Penn State has seen several of these with ducks fed "ethanol byproducts". They are following up on it. So far, no hard scientific proof.