We've had chickens for five years now and my kids decided to go into the egg business. So we ordered 60+ chickens and raised them from babies.(2 days old) They just turned six months old and started laying this week. One of our barred rocks all the sudden can't walk straight, takes strained big breathes, and seems to be HOT! Her skin is bright red along her breast bone. She doesn't want much to eat or drink. I gave her extra vitamin D and calcium. Also a shot of antibiotic last night. No change. Could it be marek's? How do I check if she has a fever? Any help appreciated. My kids have put a lot into this, I'd hate for them to lose the whole flock.