The way I integrated my August batch with the older birds may also be doable in your case. As mentioned before, introduce them as soon as they can take the outdoor temps, but keep them physically separated from the older birds. I used a large dog cage (cover the top so they don't get pooped on). Once the coop was finished I had to lock all the birds into the coop while I built the run, and that is when I integrated them; All the older birds and the August batch went in together, no cages.<Snip!>
Anyway point being, most people advocate putting them in the brooder in outdoor coop, with MHP, at just a few days old, not 2-3 weeks. Ours were fully integrated in the flock by 4 weeks, really by 3 weeks. Amazing difference from the usual method of keeping them isolated until large enough to stand up to the adults. A beautiful method.
best wishes,
--V
They were all so interested in checking out their new home they were too busy to notice the new birds were freely roaming among them and they all got along great. Nor have there been any squabbles since.
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