Does anyone remember the mineral, or maybe it was protein with fish oil (was at the time i was raising kids and not working so much with cows, around 30 yrs ago)...But we would buy something or another, from a company that supplied the feeder. They'd haul it in filled. The stuff whatever it was, had fish oil in it. It was to limit how much the cows ate. Smelled terrible. I would think, when i got a whiff of it, that stuff must be pretty good for them to eat it with that fish oil in it.. Does anyone do that anymore? A lot of people fed it around us for a while, not sure why everyone quit.