Well said! I do medicated feed, but no vaccinations.Yes it will help them build up a resistance. But it's a long time debate if this is good or not. Some say feed medicated to keep them safe and others say to let nature take it's course. Personally I don't do medicated and never have had a loss. Many think that is a risk though. So it falls into personal beliefs/preferences. I also don't vaccinate my chicks born here as want to breed healthier strains even if that means losing birds.