Hi All, I'm a newbie to this site and a new chicken mom. We just constructed a new chicken coop and run and have 6 pullets and a rooster. I don't seem to have any odor problems in the coop, but the run is a different story. It's covered, and is simply regular ground with a small amount of gravel that was already there. What do most of you recommend as ground cover to help keep the smell down?