What kind of hay do you feed your pigs when feeding hay? We pasture raise pigs and feed very little during summer months. Just enough to keep them friendly and help move them. During winter we feed ground grain and soy. We give hay for bedding and feed. However I don't think they could survive on just the hay. From what I have read the adults are the only ones that could digest high fiber effectivly. Is their a different management system for hay fed pigs? Wean them at an older age? Our hay is mostly grasses with a little red clover and trefoil.