I have a 4 month old Speckled Sussex Rooster along with 16 other birds to include two more Sussex roosters . A week ago I notice this particular rooster not going in the cop at night as do the others . I would coax him in and let them free range all day . During the following week I kept my eye on him and I noticed that he's developed a limp and his comb is paler than it was before and there's diahrhea and feather loss in the tail area . Now he barely moves around at all except for to feed and water . All my birds are approximately the same age and at least 7 hens have begun to lay. I also notice that before he got in this condition he was the whipping boy for the other two roos. Am I panicking or is it a possibility he has contracted some type of disease or perhaps he's healing from a incident that I didn't witness ?