Hello from New York Texas
Welcome to BYC! Glad you joined the flock! It depends on which wing feather sexing technique you're referring to. Also Black Sexlinks, pullets are solid black while cockerels have white on their head.
I've never done it before so I don't know how accurate it is. I use the secondary feathers. Pullet,s secondary feathers stay together while a cockerel's will spread out. I know the birds are older but it still works on young chicks that have wing feathers.
- Love is Silkie soft!
Welcome to BYC and the coop! There's a lot of great peeps here! Feel free to ask lots of questions. But most of all, make yourself at home. I'm so glad you decided to join the BYC family. I look forward to seeing you around BYC. My experience with the sex links have been acute. But good luck with yours. May they all be girls!