I have about 26 month old chicks. I had two barred rock roosters. They were doing great and then one afternoon about 2 days ago I went out to the pen and one was dead. The other barred rock seems depressed. He stands in a corner of the pen with his feathers fluffed up and is very sluggish. I have seen him eat a little. today I checked on him and was looking under his wings. The feathers under his wings were very dirty and had a little bit of brownish goop. I brought him in and cleaned him up disinfected with hydrogen proxide and dried him and put him in a box in the house with a lamp. Can someone give me some advice. Please I don't wan to loose another chick.