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Once you get older in weeks, you're going to start running into the risk of congestive heart failure (CHF). These guys were born and bred to eat, poop and grow, and that's what they do best. Most go with the 8 week range because it seems to be a good point of high meat levels on the bird and not hitting into the health issues that start popping up - some folks will get a few going down with CHF before 8 weeks, but at 12 weeks, you're going to start seeing it crop up a lot more. CHF pretty much means the heart can't handle the weight and strain, the bird starts to get a bluish comb from oxygen depravation (heart can't pump enough), and death occurs when the heart ultimately fails. If you do closely manage their feed and restrict it, you could get a BIG bird at 12 weeks - maybe in the 8lb+ range, something that resembles a small turkey. While it might sound great, bigger is better, it's just a bit unfair to the birds. They just aren't built to grow old.