The cake we always fed was cotton seed based. Cows love it. Back when we fed it, our cows would flat run over your ass if you shook it out of the sack while on the ground. Was fun to turn a city boy loose with a sack full in the middle of our herd of black angus.
Of course, we fed it from a feeder mounted on the back of one of our old Dually one ton pickups.
