I am posting this because I am curious to see if anybody else has the same concerns about the long term effects the lack of natural selection from the NPIP brings. Instead of breeding for stronger birds, people kill all of them when they show signs of sickness. I personally have a closed flock, and they have been diagnosed with at least MG. Three generations later, and I have hybrids with a stable MG resistance throughout the flock. In the past I wanted to sell poultry, but I'll never do it because that means I would have to breed a weak bird that is highly susceptible to everything. I'd rather have my own flock of strong and healthy birds, than have a flock that could die from a bird pooping on them from above.