Agree with smrobs. It's possible to peel a round bale but it's a big mess. We feed grass hay in large 800 pound round bales, 4 horses at a time. (Custom baled for us so because our tractor can't hoist the 1500 pound round bales.) They last about 7-10 days, depending on the cutting. The horses are also on pasture and seem to prefer grazing on the stockpiled grass, so they don't clean up the bales as fast as they would if they were drylotted. Last year we had grass/alfalfa mix and it was what we used during the worst of the winter; otherwise they get fed grass hay baled off our pasture. Not the very best quality mixed grass hay so they have 24/7 access but like smrobs says, they pick out the parts they don't want.