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Very interesting. That sounds logical to me, but I don't know enough on the subject to be sure. At a minimum, I can see that selecting for early laying would also to select for enough heat tolerance that they can lay (vs. dying from the heat, or being too stressed to lay at all.) I have...

I know it works the other way around: For breeds where the females start to lay eggs at a young age, the males do start to crow at an early age (as compared with females & males of breeds that mature later.) Small chickens (bantams) commonly mature at a younger age than many other chickens...