Laurie39, the best time to tell is when they are first hatched because as with any baby all the blood or half seems to be in the lower areas of the body for development and I am sure you have seen a new born child and after a few hours all the blood dissipates but just before that there is no mistake well all animals are the same this way so the best time to sex them is at the beginning of the hatch or wait till about week 12 most chicks it starts to become obvious ......
gander007

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