we've got breeder pens, small brooders and a grow-out pen. Fly traps have been put nearby to control flies. I've "poofed" DE every day to no avail. Flies are still a problem. These pens are mostly all raised at least a foot off the ground (brooders can be on ground or raised). the quail feces lies in open air. hot, aerated space. i came across "the deep litter system" in Game Bird Propagation," by John Mullins. i understand the system was developed for barns and poultry houses. can something like this be done out of doors? i'm not asking for ideas on how to create anaerobiosis in open air, but something under a "deep litter". or just anything to avoid smelly fly traps.