Um, I wasn't really being facetious. I don't want to start a flame war or anything, but for me, I worry about CRD. Chickens that "recover" from mycoplasma infections remain carriers for life, and can infect other birds. So, to me, the thing that shows the healthiest immune system, the genes I want to maximize in my flock, is the bird that can fight it off without getting sick. That still lets through the few that can be exposed and achieve a carrier state without ever showing symptoms, but short of testing the whole flock every few months for CRD, there's no way to find those.Well, I'm not sure that would be any better than medicating, since the majority would hopefully be able to overcome the illness and then pass on the genes that allowed them to do so to the next generation. Otherwise you weed out the strong with the weak.
I first quarantine and let them fight it off. If it looks like they aren't going to make it and are just going to suffer, I cull. To me, it is no different from culling for color or conformation, only in my mind for much more practical purposes.
That said, I do realize you were being facetious.![]()