I have one rooster who has a gurgling sound when he breathes. A small amount of nasal discharge but not real bad. He started this about 2 weeks ago I noticed a tiny noise but didn't think much of it, but today I went out and he was fluffed up just sitting there. Is face around his eyes was pale(supposed to be red). I brought him inside(it is cold outside). When inside I fed him oatmeal and granola. then some scrambled eggs. He drank well. After eating and drinking he would stretch his neck and open his mouth like something was stuck, or like a yawn. The red color has returned to his face and he is resting now. Any ideas I have about 30 chickens NONE of the others have any symptoms. Any ideas, I have ivermectin, penicillen, and poultry drench on hand.