Alas . I'm probably going to harvest my 7 remaining cornish tomorrow. They average a little over 4lb live weight after 6 weeks. Two of them have been killed by predators in the past 2 days. My thinking is that since I can't protect them, I my as well butcher them while I can get a return. I originally wanted to hang on til 8 weeks but at my present attrition rate, I'll soon have no chickens.