Are your pullets laying yet? If they are laying you can pretty much consider them mature as far as behaviors go. If not, you may have some issues. At 6 to 9 months old he may be mature enough to behave like a rooster or he may still behave like an immature cockerel. It's not pure age, some mature faster than others. The behaviors of mature hens and mature roosters can be quite different from immature pullets and cockerels. Yours may be fine, they may not. I simply don't know.
What am I looking for in mature rooster behavior as opposed to immature cockerel behavior? I've not had roosters before. He is a barnyard mix if that makes any difference.
Hopefully you've read up enough on quarantine to know how to do that effectively.
I have now read the quarantine article on this page and Mr. Rosco will be hanging in the quarantine coop for at least 4 weeks. We are a week in at this point. Other than eye/nose discharge, are there other specific things I should be looking for? He does not appear to have mites or lice.
I would not integrate that way. I would not lock them together where they are in a tight spot when they wake up like that. To me the risks are too high. A lot of the time integration is that easy, it often works. Integrating a boy that acts mature to girls that act mature is often the easiest integration there is. He mates one or two of them and it is his flock, it's that easy. But if some of them are immature it can go bad. If it goes bad I would not want them locked in a small space where they can't run away.
This makes total sense and I will definitely choose to do the integration in this supervised way, especially since I don't know if he is mature or not.
I'd suggest instead of locking him up at night with them where they might wake up all lovey dovey or ready to destroy each other, let him loose during the day when you can be around to watch. I like to do it in the morning so they have time. It is highly possible they will immediately bond into one flock and they will all go to bed together. It's possible they won't get along and you will need to lock him back up for a while. I don't know how big your facilities are but if something goes bad I'd want them to have room to run away from each other, not be trapped where they really get beat up.
If integration does not go well, do I separate and keep the rooster in the kennel in their run for a longer period?
Thank you so much for all of your help.