Sort of similar to another question. I have the younger birds in with the hens, 25 of each age. They are getting along fine and the setup is such that the younger birds are better off. I have two hanging feeders, one for the hens, and one for the girls, with grower pellets. Their is in their old area from which I've removed the door. The younger birds like to eat from the layer feeder but still go into their old area, so I'm just going to keep two kinds of food for another month or so. They are free range, so will have more to eat soon. I removed the oyster shell, as I heard the young birds shouldn't have it. My question is: When would it be safe to return it so that the hens have access to it? Is 16 weeks too early? Should I wait till I see those tiny first eggs? Thanks.