We raised Cornish Rock for the 1st time this year. Previously I raised Red Rangers. I kept a few Rangers and bred them, good egg layers. This year I decided to try the Cornish. I was hearing all kinds of horror stories about Cornish with medical issues finding them dead etc. Nothing like that for us they were healthy good birds, calm in nature and not little pigs! We even had some times they did not finish their feed. They were raised side by side with Ranger chicks the same age. Cornish were so big com-paired to the Rangers. We Processed half at 10 weeks and the rest at 12. The largest bird was 8 lbs at 10 weeks and 12 lbs at 12 weeks. They ate grower mash and greens. I will process the Rangers at 20 weeks. The photo is them together at 12 weeks. All I can say about process day was that I had to get an XL killing cone and I am so glad to have a whizbang plucker.