This poor guy appears to be in distress to me. The blue comb is concerning, as is the open beak. I also think he looks thin. Can you bring him inside so you can provide warmth and monitor his eating and poopi g? You need to know how his crop is functioning, as well. I don’t mean to alarm you, but I think this beautiful rooster’s condition is serious needs some targeted care.
Can you provide poultry vitamins and electrolytes for supportive care? I am in the camp of not treating unless you know what you’re treating for (and then hit the issue hard.)
Answering a few questions will help:
Age?
Feed?
Flock mates?
Coop & run details?
Also, please examine him. Is his breast muscle wasting away? Is his vent clean and clear? Any external parasites? Is there a lical vet who can perform a fecal float if you bring a sample in?
Tagging a few of the more knowledgable folks, as I think you may need to move quickly on the proper care.
@azygous @rebrascora @Eggcessive @Wyorp Rock @casportpony