Maybe I should try fermented feed.Let us know.. may be onto something.. could try fermented food, the lady that has that link for the holistic first aid kit for chickens had a video about it on her youtube. Fermented foods are good fro allergies. I give kefir to my dog and cat for allergies & yeast infection of the skin & ears.
Back to chickens, right now we freeze with being winter and fermented foods wouldn't work. I do appreciate your thought.
IF he shows that he does have irritations to the point of allergies, he'd no longer be kept as a breeding rooster. From the allergies I've experienced with my sheep...to the allergies that run in my family and that I've passed on to our son, on that basis I deem allergies to be a heritable trait. If it was manageable I would love him to stay as yard candy...that would work great. I'd never want him to suffer though.
IF he shows up to have chronic issues with redness due to parasites, he won't be kept as breeding stock because of that either.