It depends on what you are mixing together for both temperament and size. If a small breed is three weeks older than a big breed like marans then they are usually fine.in your experience is a 3 week difference in age between chicks in a brooder a big deal? Do the babies get trampled?
It would not be a good idea to put day old chicks in with three week old chicks though. The little ones need a couple of days of development to be able to get out of the way of the older ones.
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Jeff won't have 1/2 of my eggs for at least another week, I was hoping to get the other 1/2 before then but not if they can't be in the brooder together when the second batch hatches.
