Last week Tuesday I noticed my rooster acting very quiet and kind of out of it. He seems to just have lost his spirit. Today I noticed that his comb is a little pale and is starting to droop. He stays in the same vicinity of the rest of the flock but not with them and sometimes I find him all by himself in another part of the property. He is aware of me and will object to me trying to catch him but I did today and put him in a separate chicken tractor with sugar water and moistened catfood with "chick feed" - even though he is adult to give him some of the extra vitamins in the feed. He drinks but I have not really observed him doing a lot of eating. I am going to leave him locked up for a while because the other roosters (his brothers) who always got along are starting to pick on him. Any suggestions?