My two-year old Buff Brahma roo Penrod has had no appetite for almost a week. His poop is showing green bile, so he's not getting enough to eat. He turns up his beak at all his favorites - BOSS, cooked rice, tuna, cat food, and carrots. He won't touch his flock grower crumbles. He doesn't behave as if he's sick. He has no respiratory discharge. He has no infected sores or apparent swelling anywhere. I'm at a loss. I don't want to start stuffing antibiotics down him until I find an infection. I love this big guy. I don't want to lose him. Can anyone give me a clue here?