My girls free range, but I like to give them the layer's crumble and oyster shell free choice in the coop. They don't seem to eat it in the coop much. The oyster shell actually goes faster than the feed.
Every morning, before I let the girls out, I throw down food in the run. It keeps the wood chips in the run stirred up, and lets all the girls of all ages and level on the pecking order get in there and eat before they head out into the yard to free range. I also throw some down in the evening, to bring them in and get them close to the coop.
Em