We have 4 chickens who are all about 7 months old. The breeds are: Buff Orpington, Black and Copper Maran, Cuckoo Maran and a Blue / Black splash Orpington. We know for sure that the cooper maran is a rooster as he is crowing. However, none of the others crow or lay eggs. Are they hens or roosters, how can I tell and if they are hens, when should they begin to lay? We live in Central Virginia.