Hello, and welcome to BYC. Great advice on the silkies from @janiedoe. Introducing silkies to an established large fowl flock can present problems.
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Thanks so much! I love the naked neck suggestion, they look even more like dinosaurs than full feathered breeds (which is a plus to meHi welcome to BYC. The likelihood of tricking a hen into raising chicks is pretty much zero. Being broody is a hormonal response.
It is best to raise chicks. Bringing adults in can also bring in disease. I wholeheartedly recommend langshans. They are sweet, but not shy, and can hold their own in an existing flock. They make excellent mothers when they go broody.
Silkies may not do well with your barred rocks, especially with a rooster.
I also recommend brahmas and naked necks, both are confident, sweet, and occasionally broody.
My roosters love naked necks more than any other breed of hens...must be all that skin they show.
Good luck to you!
) . My only concern is the cold weather up here, we can get temps below zero F at night for multiple weeks in the winter.
Glad you joined.
We're so happy you've decided to join us 

Since you are planning on building a new coop, you can put the new birds in when you move the others into it so the new coop will be new to everyone. They will still have to establish their pecking order but it has worked pretty well for me. Luckily I have several coops. Good luck and have fun...