One of my toms is showing some symptoms of a respitory problem. I can hear him gurgling a bit when he breaths but other than that there is nothing else. His color looks normal, activity and eating normal, no discharge or swelling. I know available medications are very specific. Is there something basic I could try? Edited to add - he is a little less than a year old, and free ranges the barn yard with 1 other tom and a hen. I noticed the gurgle about a week ago. No one else is doing it and all of my chickens are healthy too.