I have a 10 month old Pumpkin Hulsey Roo. He was the leading man in my flock and the girls loved him. About 2 weeks ago I noticed him limping. Caught him checked him out didn't see anything wrong with the foot/leg he was limping on. With in about 3-4 days of limping he was down unable to walk. Poop is really yellowish. There is a LOT of clear water with the yellow colored part looking firm and formed normally. His comb had been bloody looking but then 2 days ago it looked normal and looked good. Now today it looks purple. He is eating and drinking well. I have had this happen now to 5 or 6 roosters. Only the roosters. A couple have recovered just fine and a couple I had PTS. I'm about ready to give up because it seems as if no matter how much I change my bio control, disinfect so on and so forth I"m still having issues with chickens getting ill.