We typically feed a 50/50 mixture of corn and deer protein pellets in gravity feeders. The primary thing that deer need in the spring/summer is protein. We have tried feeding just protein pellets but due to the high humidity here in the south, the protein pellets will clog the feeder and start to mold. A 50/50 mix with corn seems to keep everything flowing well. Initially one of our biggest problems was hogs eating all of the feed. We now encircle our feeders with 3' high hog fence from tractor supply using T-post stakes. A 100' roll will make a circle about 30' in diameter. The deer will jump the fence and we have never had a hog inside the fence. We keep a camera on each feeder all season long. Just be prepared that during late August and all of September the consumption rate will go way up.