I have a rooster that is having some labored breathing, wanting to perch most of the day under the heat lamp and I'm seeing some red muckus stringy type stuff in his droppings sometimes. I have him with one hen in a seperate coop with a heat lamp. I've given him Duramycin 10 and diatamacious earth. He has some problems early in his life and I'm not sure if it's connected. I'm seeing some good improvement with the antibiotics, but not a full recovery. Should I be concerned about mareks or other diseases. He was not vaccinated. What else can I do for him? More of their story.... I had a broody hen abandon her nest last fall while we were gone. We put the eggs in an incubator after we got back and two of the chickens ended up surviving even though they hatched at day 25 and needed help getting going. At two weeks they started showing some signs of difficulty with breathing, not too dramatic but some wheezing and slight laboring with the breathing. I gave them antibiotics...duramycin 10. They seemed to get better.