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The guys would have just a row of short feathers.. But this only works on certain chicks, as I tried it on my Polish chicks, and it completely did not work
The breeder flock for the female line must be slow feathering only, and the breeder flock for the male line must be fast feathering only. To breed for the chicks you would then cross the slow feathering females with the fast feathering males. The resulting offspring would be the opposite of their parents. Females fast feathering and the males slow feathering.