One of my young hens (maybe about 5 months old?) was found dead today. She was one of 5 that live in a chicken tractor. Found a few blood-tinged stools in the hen house after she passed. These hens are vaccinated. Over the summer something wiped out my first (unvaccinated) flock. Still don't know what it was. One chicken survived and the vet put her on enrofloxacin. I cleaned the tractor and keep it out of the area where it was this summer, just in case. But now I am wondering: Is my yard just not conducive to raising chickens? Why am I failing at this? I add apple cider vinegar to the water now, and keep it clean (well, change it daily). I change out the shavings n the house part and move the tractor every 5-6 days (I'd do it more often, but I work full time and have 2 young children). I had no idea that chicken were so fragile or short-lived. We put so much time and money into this project, not to mention heart.