Is there any sign of bright yellow sulfur colored diarrhea? A sure sign of black head disease.
blackhead disease (histomoniasis) is an important poultry disease that affects turkeys, chickens, and game birds such as partridges, pheasants, and quail. The disease is caused by the protozoa Histomonas meleagridis, tiny, single-celled organisms that are spread to the bird by the roundworm Heterakis gallinarum
Chickens are less prone to this parasitical infection than are turkeys, but chickens are susceptible. I have fought it several times when raising turkeys for the freezer.
The best preventative measure to prevent future infections, if this is your problem, seems to be adding massive quantities of cayenne pepper to the feed. As in a cup of cayenne in five gallons of feed. Anecdotally, garlic water and vitamin E are supposed to help also.
