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They are already too old at 10 days to feather-sex. They need to be 2 - 4 days old. There are differing opinions as to whether you can feather-sex Cochins, as they are a "slow-feathering" breed.
If you try again on your next hatch when they are younger, BE VERY CAREFUL handling wings that young - you can do permanent damage to the wing structure.
They are already too old at 10 days to feather-sex. They need to be 2 - 4 days old. There are differing opinions as to whether you can feather-sex Cochins, as they are a "slow-feathering" breed.
If you try again on your next hatch when they are younger, BE VERY CAREFUL handling wings that young - you can do permanent damage to the wing structure.