If you are looking for some green feed.......why not put a cup of barley in a tray ( planter tray)and water it till it sprouts. Leave it till it attains a hieght of 4 inches and then feed this to your pigs roots and all. You dont need soil at the root end as long as the grain is kept damp. Make sure there is no fungus growing, you might ahve to give it a squirt of fungicide just to keep that at bay.