Corn is more than a commodity. When you buy corn to put in a feeder you just want corn not the other stuff. The Cobs If you’ve ever had a feeder stop up these are probably what caused it. This is what comes of the cleaning line and is discarded. Some places sell this in their corn bag and it stops your feeder up. The Screenings Some places grind this light material up and press it into pellets. We take these low density products and feed them to our cows.