We mail ordered 10 Cornish Rocks from Ideal Poultry earlier this summer. They spent the first five weeks in a brooder with lights round the clock and then moved into an outdoor house with run - no extra lighting. We fed them chick starter/grower crumbles for the first two weeks or so and then put them on a meat bird grower mash (20% protein) from Aroostook Milling Company. We also toss in a few handfuls of fresh picked clover every day. At 8 weeks old they all look happy and healthy. We butchered four this morning - two hens and and two roosters. The largest one dressed was a whopping 3 pounds. We were expecting between 5 and 6 pounds. This is our first time raising meat chickens. What are doing wrong? Did we harvest too soon? We've heard stories of them dying if you let them go too long. We opted to not butcher the remaining six just yet to see if they can put on some more weight. Any thoughts and advice would be welcome!