Being in PA I assume you probably have timothy and orchard grass (and just mixed grass) hay. I personally feed timothy square bales, and my horses go through about 1 bale / day (bale is 50-55 lbs). Less if I have them on pasture for several hours/day.
If you have just 2-3 horses square bales are easier to feed, almost no waste, and easy to store, however with more horses I'd look into round bales (cheaper, although more waste, and you want to give botulism shot).
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