Except viruses don’t really work like that. You don’t breed immunity you breed the infected lives long enough to breed and/or pass on the virus. And it gives it time to jump species.
And resistance to one disease doesn’t mean resistance to all diseases or that the other qualities of those chickens (e.g. overall size, egg yield, temperament) are desirable. And as we’ve seen with COVID and other diseases like Polio the surviving chickens could also have a reduced quality of life after recovery.
Except viruses don’t really work like that. You don’t breed immunity you breed the infected lives long enough to breed and/or pass on the virus. And it gives it time to jump species.
And resistance to one disease doesn’t mean resistance to all diseases or that the other qualities of those chickens (e.g. overall size, egg yield, temperament) are desirable. And as we’ve seen with COVID and other diseases like Polio the surviving chickens could also have a reduced quality of life after recovery.