I'm working on slowly introducing a new Polish hen (14 months) to my small flock of 1 bantam roo and 2 bantam cochin, about the same age. Also, introducing 6 silkies from 2 mo to 4 mo old. Letting the birds mingle a little each day in my fenced in garden which is about 25' x 30'. The 1st night i tried introducing by setting the new hen in the coop at dusk and the 2 cochin and roo just went after her relentlessly, so after about 15 minutes i just removed her. Now they are all free ranging in my garden and all are fine except that the rooster will keep hunting the polish down and give her a couple of good pecks to the head until she curls up in a corner or under a big cabbage plant. He's breeding her a few times but mostly just hunting her (it seems). I expected the hens to go through a pecking order, but don't know what to think about this roo? I plan on keeping them seprate at night and letting them free rang together for another week before trying to put the new hen with the others in the coop at night.