I don't feed it but have some friends and neighbors that did. They call it mustard. I say "did" because most all of them have quit due to price. They started out buying it for less than $30 a ton ($28 I think) last fall but last time I heard it was over $70 now. No first hand experience, I've never fed any, just what one of the guys feeding it told me. I think they were feeding a tanker load per week, delivered by the ethanol plant,  but didn't want to keep any more than that on hand because, according to them, it wouldn't keep.