Corn feeder/slingers that only feed in daylight are prefered. Some are increment programmable in 30-minute segments starting at low ambient light of daylight/night fall and proceed/receed for up to 2.5 hours. So you could get a corn sling feeder that programmed for 9:30 AM (+/-) and again at 5:00 PM (+/-) for two decent feeding per day. Get one that the slinger platten is aluminum with upraised sides and it will "ping" when spreading, which to the hogs is soon the Dinner Bell. Leave them alone for a while after the slinger is set to give them a chance to become complacent. Then HAMMER 'em.