I have 6 red rangers that I believe are all roosters. They are currently 8 weeks old and based on the two I weighed, weigh between 4.5 and 5 pounds each. I'm trying to decide when to butcher so I can coordinate with a grandparent sleepover for my fiver year old boys. Is 8 weeks too early? How much bigger might they get if I wait for the 12 weeks? They are currently eating a mix of 20% chick and 16% layer since I don't have a way to separate them from my layer hens. If the difference in the flavor of the meat is good enough, I'm planning on building a tractor for the meat birds next year.