tsperry88
Songster
I have 2 different ages in the brooder, but will begin integration when the younger ones are 4 weeks. This article may be useful:
https://www.backyardchickens.com/articles/integrating-new-birds-at-4-weeks-old.72603/
https://www.backyardchickens.com/articles/integrating-new-birds-at-4-weeks-old.72603/