I have a mixed flock of various breeds with a BR/cross roo. There are nine hens in there now, but I am about to add four more which would be thirteen. I have, growing them out right now, a pair of Light Brahmas, a roo and a hen, that if at all possible I would like to add to this group when they are old enough. That would bring the total hens up to 15. Is this a possibility, or am I just looking for trouble. I would do introductions slowly, and they would be monitored, but just wanted to see if I should bag the idea and make a little tractor or something for the pair. Thanks! ETA: If it is a possibility, should I add them into the flock while still on the young side, or wait until fully mature? I was thinking kind of on the young side before the younger Roo hits puberty to make him less threatening, but I don't want him defenseless either.