Hmmmmm why do hatchery chicks start later?
I don't know! this is just my experience

I got the hatchery birds at 12wks. they were raised on a farm near me.
I raised the non-hatchery birds from eggs myself and ensured they had the best possible nutrition from day 1. I also felt that they looked more mature, healthy and robust at 12wks than the hatchery birds...

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