We have 2- approx. 12 week old Golden sex links. Today we aquired 2- 5 week old production reds. I know they are healthy and bug- freeand I wanted to put them together quickly. So I introduced them into the coop with the older ones from the start. They acted fine at first. Then the slight peck and baulk here and there started, it progressed to chasing and holding down and hard pecking. I knew it was a long shot, but I tried. We just finished our new hen house, but haven't finished the run so I moved the younger 2 to the new hen house where they are locked in. I will get a dog kennel tomorrow to put them in so they can coexist in the old coop with the other 2 while being protected. Will this work or should I leave them in the other coop for a while? Advise or other ideas????