Hi there,
I have raised meat bird for the past two years with my family. We did 12 last year and 25 this year. I too agree at what a strange bird to grow so incredibly fast. They are always hungry and will eat as much fun as they can at any opportunity. I think key is monitoring how much feed you give them so as they don't develop so fast that they literally have a heart attack.....and yes this happens. That being said, I would never just leave food out to let them self feed. I fed in the morning when I let all the chickens out of the coop and around 4 or 5 pm. I also have wooden logs and perches set up in their run, so they have placed to hop up on things and keep their interest from just food. You just have to remember that they are a differed breed entirely than a dual purpose, which I raise as well. They are developed purely for large breast size and a fast rate. We processed all of our meat birds ourselves and I love knowing exactly where my food came from. We processes half at 10 weeks, and the next half between 11 and 12 weeks. They were leaps and bounds tastier than a store bought chicken. There is something wonderful about having that relationship with your food instead of the dis-association that most of us have with the food industry today. The protein has lasted us all year and I'm proud to say that we've bought NO chicken from the grocery store this year. I will do the process all over again next year. Yes they are strange, grow freakishly fast, are a mess in the coop, but I know that my food was treated with respect and will nourish my family. Hope the rest of raising the meat birds goes well for you.