Another thing...for a week before butchering, it is common to separate the dinner guest and provide a feed mix that is higher in calories and less protein..a "finisher" blend. When we've done this with chickens., we've brought them into the garage and put them in a wire dog kennel to restrict how much exercise they get, the meat seems to be much more tender because it adds a little fat and the bird is much calmer being removed from a dog kennel then chased around the pen on butchering day. There is a "wives tale" that if you stress a bird, their meat will be tough.