Just got in a new batch of about 3doz. White Rocks. This brooder I made a few years ago from our old big satellite dish. A door was made in one side and a heat lamp hung from the center. The sheet metal tops I added to the feeders to keep you know what from dropping into the feed from above. They all seem to be doing pretty good. Only one was DOA. So far......so good! Rice hulls make up their underlayment.