Also try to get similar sized birds... like I wouldn't get a tiny Sebright and mix it with a Jersey Giant for example. A little size difference is fine, but if it's too great, then the big birds will pick on the little ones, and if a rooster is involved, could injure a tiny hen.
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I agree about the rooster & small breeds, but bantam hens with standard hens will hold their own. They don't know they're small and can be at the top of the pecking order.