Frizzles losing neck feathers. Why?

[PikaVic]

Hello. I have tried to find answers to this question on this forum and the internet, but no success. I have three frizzle girls, all hatched last June. Their dad is a pure Polish frizzle and moms are not frizzle so these hens are definitely not double-frizzle. Recently they have been losing all the feathers on their necks. Their dad looks quite scrappy now as well. There is no feather loss in any of my other chickens - it is limited to only the frizzles - so it seems like this would not be a mite issue. I am wondering if frizzles are more susceptible to feather loss than non-frizzles? Does this have something to do with the frizzle gene? Any input would be greatly appreciated!

 

[nanaluvsgps]

The frizzels could be just multing as when chooks malt they loose the feathers on their neck and tail feathers area. They mult any time after winter but 2-3 before the next winter. All chooks mult at different times to.