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There is no way to assure gender in fertilized eggs, much to the concern of the major hatcheries as they would clearly love to produce ONLY hens. Cockerels are not nearly as in demand as hens and if they could, they would be very selective in the hatch. Having the incubation heat too high will however produce a higher than normal male to female ratio as the males can survive higher temperatures when in development. It does not work in the opposite direction however. Lower temperatures in the incubator just slows hatch and does not effect gender viability.

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