My first flock of meat chickens are five weeks old now and weigh between 14 oz. and 2 lbs. I got red broilers and Turkens from Ideal and they threw in a bunch of packing peanuts that I think are Cornish Rocks. My processor wants me to give him 2-weeks notice to schedule a date for butchering. Anybody have any idea how I can calculate what that date might be? I also have some Cornish Cross that are 2 weeks old and weigh about 1/2 a pound. I've read so much on this site about not letting Cornish X go too long past their ideal butcher date that I'm concerned about how I'll know when to schedule the deed. Does anyone have a good rule of thumb to help me calculate? Can I estimate the average weight gain per week and extrapolate an estimation? Any ideas?