More Feed Store lore here, just checking it with you all. My hens are big, fat, beautiful Barred Plymouth Rocks, the eldest must be at least six months (she's a rescue, so exact age not known). The younger two are about four and a half months. None of them has a red comb or wattle yet, although the eldest is pinking up. I read that starting them on layer feed could help them, so I started them on it last month. Since none of them are laying, still, the Feed Store guys suggested I give them oyster shell. I bought some, but figured I'd better check this info with a more reliable source. So, will oyster shell get them started laying? Or should I just hold onto the shell until I see that first egg?