When do people feel that it is a good age to introduce 1, possibly 2 new chickens of a different breed, to the 2 hens we have raised from hatching. Ours are currently almost 4 weeks. We will have to wait for a while as we only want to get hens and need to wait o be sure of gender - but I am wondering whether it would be better to let our two grow up (7 or 8 months or more?) before introducing new, slightly younger hen(s). Also should we get two more, or one? We are not really after the eggs (clearly - with only 4) but the two we have are so attached to each other that if something happened to one, I would worry that the other one would be left on its own - and probably have to move into the house with us!!!