I was reading about Chukars and other game birds over the winter. Most suggest that they be raised off the ground in elevated flight pens. Game birds, as I understand it, are more susceptible to soil-borne parasites. If they stand around in there own poo at high densities, there is an increased risk of those types of nasties wiping out a high percentage of birds. Again, that's only based on reading and not experience so take it with a grain of salt. I do know folks that have ground-based flight pens and they didn't have much success. Their problems were more of a failure to thrive and cannibalism than disease and parasites though.