I thoroughly agree with Bee. Given a choice, chickens will gladly range all day, and they will lay better. I notice that when I let my girls out in the morning (not in the winter, when everything is frozen solid and covered with snow and ice) they immediately start grazing on the grass. Only after they've spent some time grazing, do they move into the woods to scratch for insects through the leaf litter. It's amazing to stand and watch them industriously working through my yard. Even in the late fall, after several hard frosts, when there are no insects that I can see, they'll spend the day foraging, and their crops will be rounded right up by the time they return to the coop. They have feed available in their run, but prefer range feeding when given a chance.