If you look around the paddock paradise sites, you will see that they have slow feeder of several kind. The idea is to provide constant access to hay, but make them slow down, which is much more natural than just standing in front of a bale all day long. I make my nets out of the strings from bales, and have about 5cm holes. And all I can say it does wonders. They nibble a little here, then go to the next net(could be there is something better, lol), then to the next, so they are constantly moving and never have an empty stomach. I need much less hay that way, nothing gets wasted, and horses know they always have something to eat. The best effect is that my overweight horse has lost sufficiently, and the rather lean one has gained.