I butcher my extra cockerels around 14 weeks of age. I've waited till 22 weeks in the past but didn't find it to be worth it. Mine are all a mix of Ameraucana and other breeds so they aren't a meat breed/mix. At 14 weeks they don't have a ton of meat but it's enough for a meal for two. I also raise quail for meat and the chicken is way bigger and has way more meat.