Does Anyone Know How to Sex Cochins at Birth

[keesmom]

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This only works with certain breeds.

 

[InsaneBreeder]

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The hatcheries sex standard chicks accurately, but the bantams are too small to be vent sexed, and so if you look up any random hatchery, you will see that all bantams are sold as straight-run only.

Actually MYPetChicken sexes bantams
http://www.mypetchicken.com/catalog/Bantams-c46.aspx

Really? Is it accurate? Can they do all bantams?