Theory on sexing chicks, is it correct?

[Sussex19]

I understand about feather sexing, and that you need the correct genes of fast and slow feathering in parents. (I can never remember exactly what you need to do it, but I have certainly got the principle of it)
My question is, I have noticed that a certain cross I have, has chicks that at around 5 weeks of age, the cockerels have a lot less feathering then the pullets. I was wondering if I have accidentally got feather sexable chicks i.e. would it also work at a few days old?

To clarify, is there a link between slow feathering at 5 weeks, and at a few days old?

 

[JacinLarkwell]

Yes, I believe that is what makes the babies sexable.

 

[NatJ]

To clarify, is there a link between slow feathering at 5 weeks, and at a few days old?

Yes.

Here's a wikipedia article that talks about it a bit, and has some comparison photos:
https://en.wikipedia.org/wiki/Delayed_feathering_in_chickens

The slow feathering that is used for sexing at hatch is the same as the slow feathering that is so obvious a few weeks later.

 

[Sussex19]

Thanks guys!