Apparently you know less about chickens than Global Warming. By reading your posts, I didn't believe that was possible.
It's not a choice that a farmer has any part in making. Just like man has no part in Global Warming.
In the '50s I had a friend who ran a very large chicken "farm". He had a lot of control over what his chickens ate. It's also well-known that our meat supply can be easily contaminated by whatever our meat supply eats.
Do you deny any of that (try to understand my meaning before you reply)?