chicken Beard won't grow back

[frcebwthu]

I have two bearded chickens that my kids are taking to Fair. They have been separated for a month now and their beards are not growing back. I hashed then on a high protein diet, all of their other feathers are growing back but there are not even any pin feathers growing on their beards. Thanks for your help.

 

[lightchick]

I'm not sure what could be wrong, but I'd wait and see what happens.