If you give them a shot again in the future try cutting the feed at two weeks you will be surprised what a difference a week and a half will make. When you can slow their growth you give their organs a chance to catch up with the rest of their body. I guess it would be like feeding yourself in a way... if you weigh 500 lbs and your body frame and organs only support 200 than your at a higher risk of heart failure...and basically your put on a diet. It's not my experience it's simply the anatomy of these birds. They do have flaws and they do die at any age....any animal does..... but if you know what your going up against and try to exploit ways to counter attack those flaws than by all means at least try.
Jeff.
Jeff.