I culled one yesterday and another today. They're right at 8 weeks, I think. They both were breathing with their mouths open, so I was concerned. The first one died while upside down in the cone. It died before I even made the cut. It started opening and closing its mouth and just died. The one I did today started to do the open and closing of the mouth thing, but I cut before it died. Is this normal? Is the open mouth breathing and labored breathing a sign of heart failure? They're not big. The first one dressed at 3.5 lbs, the second is probably the same. Overall I've been very disappointed with these birds. I split an order of 26 from Meyer with my friend. All but two of hers died within 3 weeks. Out of my 13, I've ended up with 7 to process. One died the day it arrived, I wasn't upset about that. Another died at 2 weeks. Two more had spraddle legs, one died randomly at 4 weeks, another was found dead in the coop at 7 weeks. I've done everything I'm supposed to do. They were under a brooder lamp until fully feathered, given great feed, I even tried to get them to forage in a tractor. And now I've got birds that are smaller than expected dropping like flies. Throw this chick some advice.