I have a flock of Buff Orpingtons. The dominant rooster is 3 1/2 yrs old and about a week ago he started acting odd/different and was making a hen-clucking-like noise every time he would take a breath. As this progressed I could hear him laboring to breathe. Two days ago he started opening his beak really wide (like a yawn) with every breath. Now I can hear him laboring to breath with each breath in and out. He also is staying away from the flock, and the non-dominant rooster had him pinned down to the ground last night with the big rooster not able to defend himself. I separated the non-dominant rooster from the rest of the flock so now he cannot get to the dominant rooster. Anyone have any ideas what is going on, and is there sometrhing I can give him to correct this problem?