I got two Partridge Rock roosters and one brown leghorn to keep an eye on the twenty-seven hens in my flock. All were vaccinated for Marek's disease and coccidiosis. Five weeks ago, at an age of 16 weeks, I found one sitting in the corner of the coop looking really lethargic. Considering the fact that he had been sitting against the south wall of the coop on a hot summer day, I thought I'd start by moving him out into the run for some fresh air. I would not have called him "wild", but when he let me pick him up with no resistance, I knew something was wrong. In the run, his rivals tried to run him off. His gait did not look right, a little bit like he was wearing boots full of mud. High speed was not achieved. I prepared a "hospital", and separated him from the flock. In the morning he looked better, and I suspected that he had been bullied (he was the smallest rooster). Unfortunately, his condition turned out to be on a downward trend, and the bullying theory was abandoned. I tried to find other symptoms that could help with a diagnosis. He showed no signs of respiratory illness; no sneezing, nasal discharge, watery eyes, wheezing etc. He looked alert; eyes open. Eating and drinking were poor, but he did eat and drink some. No signs of external parasites. Comb looked pale. Droppings were somewhat diarrheal. I was reluctant to take him to a small animal hospital that appeared to specialize in dogs and cats, and knew of no avian veterinarian in the area. About a week after the onset of symptoms, his condition still deteriorating, I made the decision to euthanize him, and perform a DIY necropsy. (I didn't really want to say goodbye to any of my birds, but the "free extra" rooster was the least valuable of the whole flock.) He was very thin: little meat on keel bone. Respiratory tract looked good to me: no inflammation or mucus. Crop was empty. Gizzard had grit, and what appeared to be a few wood chips in a mustard looking substance. Gallbladder was oversize (because he hadn't been eating?). Intestines contained some substance of dark color and wheat grain size and shape, some of which had been passed during the last minutes of life. No sign of internal bleeding, or intestinal rupture. Finding no information that provided a positive diagnosis, I decided to call the experience "history" and keep an eye on the rest of the flock. All seemed well until today, when the other Partridge Rock (now 21 weeks old) started showing the exact same symptoms. Any suggestions or ideas?