that's part of what i *didn't* like about my white pair i had (and sold again)... the white frizzle girl looked positively anemic. even after she started laying again.Im not sure to be honest, thats why I didnt say anything. I dont like giving my opinion about things like this, because I am unsure if its correct. Id rather not say anything feeling unsure, than spread false information accidently. But, since you twisted my arm and all, lol, I believe its something to do with nutrients, vitamins something like that? I notice it in females that have layed regularly for a while, and also birds that are broody. I also think it is a sign of calmness, being scared, etc. and they can control exactly how red they want their face to be, but I really dont know. I thought I read that somewhere, but cant remember where.
~Casey