My year and half old Araucana rooster has recently started having a quiet, muffled voice and loud breathing like his throat is obstructed or there is mucus in it (like a person that has lost their voice). Everything else about him is normal; he is still eating, drinking, mating, and acting like a normal chicken. Any ideas? If he's sick I want to isolate him from the rest of the flock but everything besides his voice and breathing is normal.
As I said, nothing else is wrong with my rooster (no swelling or discharge). Just the muffled voice and wheezing. I've raised chickens for the better of 20 years and have never seen this problem before. It's not like a respiratory infection.