I've free ranged and never known about grit, for ~10 years. I hope they got enough roughage on their own. We just put a sand floor in the coop, and got a half yard of DG in the process. I was going to use for the floor and was told to have something soft for the new Barnevelders in case they fell off a perch, got worried about the DG and went back for sand. Now that it's in, I think either would have been soft enough. The DG is sitting out there, with an old railroad tie to keep it semi in place. The chickens love it for dustbathing, and a few are gobbling it up like crazy. I can tarp it if they shouldn't eat it. Thanks in advance!