We have never used the cage method. Are your chickens allowed to free range during the day? We have a very mellow flock as it is (Orpington, Cochin, d'Uccle, Maran, and Ameraucana), but adding fully feathered pullets/cockerels at night you'll have your best success. Add in even numbers so they can buddy up. If the flock anticipates going outside in the morning, or allowed outside at free will, you shouldn't have a problem with picking. Our bullies are the guinea fowl we keep with the chickens. They're the bosses. Other than that we've never had a problem.
Yes their able to go outside during thr if they want too. But it been so cold here, they just poke their heads out and go back in. Their so funny when they see the snow. I left the cage door open and let them come out on their own. So far not much pecking. The rooster seem better them then the hens. The hens are pecking them now and again. But they do look like their getting comfortable in there already. I'm very happy
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For some reason, our Roos were the same way. They kinda are daddy to the pullets. The hens are always kinda bossy, but they're that way with each other. Once pecking order is established they won't have any problems. Do you have a heat lamp I'm the coop for the new ones? Or were they off the lamp when you moved them anyway?
I don't quarantine any of our own chicks. That's foolish being chicks are raised separately anyway. New ones, yes, but once again, chicks are raised separately until fully feathered. I separate by size.