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I hope I don't get in trouble for asking this again, but does anyone know the answer to this?
I'm not sure, but when I butchered 15 week old FR they had a bunch of different size egg yolks in them, not sure what their ovaries look like. I usually can tell the difference in sexes by 2...
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I'm pretty sure this has to be done by 4 weeks old for it to work. For the most part you should be able to tell the sexes apart by 2 to 3 weeks. I've had some of my Marans roo start to practice crowing at young as 2 weeks.