Hey friends , I have 2 hens that I've recently acquired from my Grandpas passing. These 2 hens have not laid any eggs since I've moved them here, but I don't know if they've ever laid eggs before, because they look on the young side to me? They are black Australops, beautiful birds! How old does a bird have to be before she lays, I have no idea how old they are? Also how do you feed the oyster shell to them, do you mix it in there feed or put it in a seperate bowl? Can I use something else other than shell such a lime/stone or gravel? Thank you all, y'all are always so helpful to me and I appreciate it.