I've been reading posts regarding vaccinations, antibiotics and other health issues with chickens and it seems that most people buy chicks that are vaccinated and who are also put on antibiotics if anything occurs with their health. I've also read, however, that vaccinations are typically sold in large quantities more for commercial farmers. My question is, should backyard chicken owners with a small flock just never let their hens hatch any chicks? Is it better to just always buy new vaccinated chicks? Seems so pointless to not be able to see new generations of chickens come out of your own flock. One non vaccinated chick that may get something from their parents who are vaccinated but still carriers would mean your whole new batch of chicks would then get sick and even if they don't all die, a lot of people say just "cull" your entire flock. Respiratory diseases, mareks you name it. I can't imagine this was the case back in the day. Is anyone successfully breeding stronger birds by breeding those birds that are able to fight off these diseases and able to sustain a constant cycle that way? Is there info somewhere that we can read more about THAT type of chicken keeping?