Here are my very small NN survived from eggs from Banjoejoe. And Victor my only surviving adult rooster.if your NN roo is homozigous them 100% would be NN but silkie feathering is resesive and it would take 2 generations to get a show girl
breed NN roo with silkies---if homozigous 100% nn if hetrozigous 50% nn --all would be smooth feathered
keep F1s that has 5 toes and breed them back to the silkies ---50% would thatch NN 25% would hatch silkie feathered
keep silkie feathered NN and breed back to silkies--- to get 50% show girls
If I have the patience, I might breed blue partridge Showgirls. OTOH What color showgirls do you have Joe. Since I would love some eggs from your dark skinned birds ?