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yep thats the way it works.
Feather sexing is easy, but it requires that the chickens be specially bred to manifest their sex in differences in the feathers as hatchlings. These are usually hybrids rather than true breeds, and are called sex linked chickens. Female chickens in these breeds have longer wing pinfeathers than the males do, which makes them relatively easy to tell apart. Most chickens do not have these traits bred into them, and the hatchlings are identical to all but the skilled eye of the professional chicken sexer.