Ok, newbie question. I have 9 hens that should be getting ready to lay in the next month. I got them as day old chicks. They free range from sun up to sun down, and have all summer, they go into their coop at dusk and I lock the doors. They have fresh water in the coop and out. I do provide layer crumbles, but I let them run out and give them as treats most of the time because they free rage. Do I need to get oyster shells also? Is there anyone here who has successful egg layers without them? Does it matter if the roos eat them? My chickens are never separated.