i have found that wing feather sexing is accurate on all standard chickens, NOT bantams, or quail, or pheasants, of the sort...
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This is will only work if the chicks were bred with the traits for it to work.
do you know what breeds these are?
Your right... thanks for the link... i guess you can't believe everything you read off the internet...Read this:
http://www.ca.uky.edu/smallflocks/sex_linked_crosses.html
To get reliable results, you need to pair a fast-feathering male and a slow-feathering female. Considering that the resulting chicks are slow-feathering males and fast-feathering females, your male chicks would not be useable for future breeding of feather-sexable chicks.
Im a very skilled vent sexier and I can tell by the length of there wings on day one the female has a bigger wing feather and the males is short