You could skip the garage brooding altogether since you plan to put a divider in the coop anyway. That’s what I do so they are all familiar with each other from day one.
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My chickens are inside. I have a coop with an existing flock, but there is no way to integrate them safely right now, especially after the flock tried killing some adult birds this spring that I had tried all winter to integrate. I am also in the north and our temps drop below freezing at night still. My babies are only 1 week old, so I know they aren't going out for another 4 weeks, or so, then we will work on getting them into their own run for the day, while the adults free range. I think it's all about preference, housing accommodations and temperature zone, as to where you keep your little ones.Ah see I've been getting most my of chick raising knowledge from the 2018 newbie board. We are from Texas & we've been getting highs up in the 90s already! My best friend was telling me they brood their chicks indoors as well (also here in our area). So I really thought it was the norm regardless of your area. That's why I really enjoy this forum, we get all different experiences and information from knowledgeable owners.
Don't mean to be rude but trying to integrate adults is much harder than integrating chicks into a flock. Any adult is seen as an interloper, a threat to the pecking order and a competitor for food. As such they must be put in their place and of course they often think otherwise. Chicks are little things that won't fight back and are not seen as a big threat to society. Clearly they need a safe space in the coop that the older birds can't get to but being seen by them is good. As they grow, they figure out flock dynamics and can slowly integrate over time.I have a coop with an existing flock, but there is no way to integrate them safely right now, especially after the flock tried killing some adult birds this spring that I had tried all winter to integrate.
Don't mean to be rude but trying to integrate adults is much harder than integrating chicks into a flock. Any adult is seen as an interloper, a threat to the pecking order and a competitor for food. As such they must be put in their place and of course they often think otherwise. Chicks are little things that won't fight back and are not seen as a big threat to society. Clearly they need a safe space in the coop that the older birds can't get to but being seen by them is good. As they grow, they figure out flock dynamics and can slowly integrate over time.
Sounds like you need some more room before you try integrating anything again. It appears that the submissive ones weren't able to get away from the others. It will help if you can also put some hiding places in the run for the others. Pallets or plywood against the fence (but open on both ends so a bird can't get trapped), more roosts in the run so the others can get up out of the way.Your not seen as being rude at all. Just a clarification though. I do know that the adults are harder to integrate. That being said, the ones I was trying to integrate were very submissive, and never tried to assert themselves, they always backed off or ran away. The other chickens would corner them and gang peck them to a pulp. The one hen was pecked so bad that I swore they were actually pecking her brains out. It was horrid and gruesome. After separating them again, and nursing them back to health, I was able to rehome them. So, as you can see, this type of behavior is what is worrisome. Little chicks have no chance against these types of gang-ups.