I have found my favorite meat chicken and the variety is ironic because of present cost of these varieties. It is the huge Greenfire line light and Coronation Sussex. These birds get huge and put on weight pretty fast. Butchered 9 roos yesterday at about 14 weeks. Even with only about 8 hours of resting they were more flavorful, juicy and tender than any cornish cross I have eaten. Average dressed weight was about 4.5 lbs. Have no idea what feed efficiency was. This is the only "dual purpose bird" that has seemed worth raising for meat I have encountered. Other varieties tried including Marans, RIR, several others have been tougher and less tasty by the time they reached a size suitable for butchering. Only butchered extra roos with less than optimal feet. A lot of week toes in this bloodline.