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Sex organs on the chick are already forming by five days into incubation. Temps won't change that. Temperatures may affect reptiles and perhaps one sex is hardier than the other if there is a damaging temp spike, but temps don't actually determine the sex of birds.

No way, sorry. That means hens I have who lay super oval/rounded eggs would only produce pullets. For example, my Lexie's eggs didn't have a pointy end at all and she produced 95% cockerels. Think about it--would hatcheries kill millions of male chicks yearly in grinders if they could just...