I just introduced 2 7 week old tired to my other 1 1/2 year old sir's. Of course there was some excitement at first and every once in awhile one of the older hens go after the little ones but for the most part the little ones stay away. My question is will the big hens kill the younger ones? Never done this before and not sure what to do. I know there will need to a pecking order established just don't want the younger ones hurt.