I am amazed that you get away with even letting them out. I am so afraid of a coyote making off with my waddlers... I will take them for a bit of a walk and lead them back and feed them.
Just got mine this year. Last year, I got layer chicks at the same time. A 4 week old layer chick next to a meat bird, makes the meat bird SEEM like an adult, but really they are just humongous chicks, so I would not expect adult noises. Or behavior.
As for meat, I don't think I will ever try...