I am not aware of any extant strain of goats that will eat hay off the ground, under a feeder unless they are absolutely starving. Most will not even eat hay that has cow spit anywhere near it. Goats might come up to a feeder and pick some of the weeds out that the cattle have shuffled through, but they aren't going to clean waste hay off of the ground. Feed your cattle square bales on the ground. Cut the strings and spread the bats, or pads out. With big cows that are really hungry with no grass to eat, you can divide them in half. With younger stock or with more available grass, you need to go with individual pads. Spread them out visualizing the length of a cow, make sure there is enough distance that if they poop while eating one pad, it isn't dropping on a fresh one behind them. Switch to a clean place each day, helps reseed your pasture while you are at it. If you have much waste using this method, you are feeding too much, or your hay isn't much good. Any animal, when presented hay in a feeder, will eat the stuff they like first, often spilling good hay, but just not favorite hay, on the ground. Once they step on it, it is no good. After a while, they become conditioned to assume anything that is lying on the ground is no good, especially when they always have a full feeder. Feeders are better for sheep and goats, who are bad to step on the hay while eating it, and after it smells like a foot has been on it, they don't want it. You can still feed the on the ground, if you spread it out enough. Feeders are best for barn stalls and small lots, if you have pasture, feed on it.