I have 14 17 week old black sex links, I have been told they should start laying anytime...if they haven't already. A few of them really seem close nice red combs, and squatting when you touch them. We try and let them freerange part of the day if not all day, but I am worried some of them might lay in the bushes, we don't find it and they make a habit of it, or they lay another animal gets it and trys getting in the coup and that we just flat out don't know she is laying. Also we have some younger girls in there, and I read somewhere giving them layers mash isn't good. So I do part layers mash, part chick starter, and part chick grower. So can I give the girls egg shells crushed of course on a seperate plate so they can get the calcium they need to make the eggs? And will it hurt the younger chicks to eat to much of it?