Our 13 week-olds now have their big girl feathers and are turning pinkish red on their combs. They are almost as big as the sex link hens now. So next week after I give the big girls their second dusting for lice, it's time to blend them together. The young ones have been in a grow out pen attached to the chicken run, so they all know each other. The only problem is that we have one chronic broody hen with a nasty disposition and two monster hens I refer to as the "SUMO SISTERS". They were and still are mean to the one year old sex links, so I'm thinking of putting the nasty girls into the grow-out pen when the young ones move into the general population. I'm hoping that will help the new girls join the flock and then reintroduce the nasties later. I'm just not sure how long to sequester the bullies away from the flock and will this change their rank in the pecking order or maybe even change their behavior to the others. Any advice appreciated.