I believe that my hens died of different causes. One had runny yellow poop and was very lethargic the day we left or Christmas out of town, she died today. The other hen died today in a nest box and had no symptoms. Her vent is almost purple and there was a sign of poop and broke soft eggshell in it. Another hen just hatched 6 chicks last night and I have 17 hens and a rooster left. Concerned and wondering what to do. Can't afford a vet to look over all my chickens. I've red the yellow runny loop thread that described blackheads. What exactly is it (technical name)? I see nothing on YouTube which I get a lot of info from and this site as well. Sorry if I jump back and forth, I'm a bit befuddled right now.