Universal Feeders controlled feeding system allows your livestock to only eat a small portion of their daily ration at a time.  It works by only allowing access to the grain or feed that will stick to their tongue.  As the sheep, goat, or cow eats, its tongue becomes dry and the feed will no longer stick to its tongue and after a few minutes the animal will leave the feeder.  Livestock can not consume their whole ration for the day in one licking session, but will need to make multiple passes at the feeder through out the day. This is where another great benefit of a saliva lick feeder comes in, having the grain ration incorporated into their diet in these small amounts through out the day makes for a more stabile rumen environment and better forage utilization.