All Cockerels (almost)


10 Years
Mar 10, 2009
Cartersville, Ga.
In the spring I incubated and hatched a few dozen eggs and they have almost all turned out to be male. Does temp determine the sex? I guess I should know this. I have 1 pullet and 6 cockerels after die-off and giving some away. Oh... anyone need some cockerels.....
Nope... if temperature, or shape of the egg, etc, had anything to do with it, the hatcheries would be doing it already.

Just the luck of the draw.
It's a chromosome thing, fairly similar to the XX vs XY in mammals. In birds, males are homogametic (ZZ) and females are heterogametic (ZW). You'll usually get about a 50/50 split, though there are some studies that show that outside factors such as the age of males or availability of resources may provoke a slight skew. No, there's nothing you've done wrong.

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