Lacy, so far so good on integrating my 11-week old Blue Andalusian cockerel with the old BR roo / old flock, thanks to your tips. I put both flocks in parallel runs for the last 2-3 weeks, feeding up against the wire. A few nights ago, I started letting them in together right before bedtime, with supervision. The old flock allowed some pullets up on the roost with them, and a couple even tucked under the old hens like chicks. My young cockerel put himself in his cage last night, and I am moving all the youngsters into cages for the night for the time being. I haven't quite got all my roosts installed yet, but have some temporary subordinate ones that the youngsters are using.
My old roo seems to ignore or think the BA cockerel is a pullet, even though the cockerel is now crowing. The cockerel is very defensive of his flock and will attack the old hens who wander too close. I'm hoping this will reduce over time. He did challenge the big ol' roo with a puffed up approach, and my old roo just looked at him like, "You've got to be kidding." My old roo did break up a fight between an old hen and a new pullet -- cool to see!
So when the BA cockerel matures, will he challenge the old roo to a fight for dominance? Will the old roo try to put him in his place if he tries to mate? Any benefit to separating the BA roo until he gets through randy adolescence? Any chance each will just co-exist with their own flock of hens? Old roo has 6 hens, BA cock would have 9.
Sorry for the barrage of questions but I'm short of experience here. Thanks again for the help.