In regards to the blackhead disease, I run/house my turkeys with my chickens, they were raised together since birth. 1 year into it, my toms developed the dreaded disease! It happened overnight. they had all of the symptoms, blackened faces, swollen sinus, lethargy, and yellow,runny,bloody droppings. I immediately gave them 1/4 cup garlic powder, 1/4 cup italian herbs 1/4 cup cayenne pepper per 15 lbs of food. It worked immediately. Garlic is a natural dewormer, the italian seasoning consists of rosemary, sage, oregano, parsley, basil, and thyme, which have antioxidants, and cayenne/chili contains capsaicin. Ocellated turkeys eat peppers in central america, I have observed my turkeys eating cloves of garlic, I'm sure peafowl might do the same to rid themselves of harmful parasites. I also use above ingredients as a prophylactic, I just reduce the quantity to 1/4 cup each per 50 lbs of feed. I keep tetracycline general antibiotic on hand, but I only use it as a last resort. Antibiotics can cause more harm than good in the long run. Just MHO.