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Sex isn't "decided". Every cell (from the ova on) is either male or female based on the chromosome layout it receives from the ova.

There's no chance for a change - but there is some bit of truth - but not in any sort of way that's helpful. The bit of truth I've seen is that roo chicks are significantly more hardy in the shell - so when I have incubator issues (like the temp running too high/low), I get ratios significantly...