During the past ten years an apparently infectious Pneumonia appears to have become steadily more prevalent in sheep in this area; and the writer's experience has been that Border Leicesters, especially rams, have been peculiarly subject to this disease. Even poddy lambs of this breed have been seen affected; and not one case has been known to recover without treatment.
In type, the disease appears to be most insidious; the lungs being involved very extensively before the animal is obviously in ill health. Autopsies on sheep which have continued to graze have shown a very small portion of the lung only which could be said to be normal.
No particular reason can be given for the apparent susceptibility of the Border Leicester breed in this part of the State; nor for the incidence in rams of this breed.
Treatment with Sulphanilamide: During 1945 attention was drawn to three young stud Border Leicester rams which apparently were suffering severely from an Infectious Pneumonia. Following slaughter, post-mortem examination of one of these animals showed one lobe of the lung to be affected almost completely, with considerable pus formation.
The remaining two rams were treated with 15 gms. of sulphanilamide as an initial dose; followed by subsequent doses of 5 gms, twice daily for six days. Within three weeks both rams showed very appreciable improvement in health; and when seen six months later they had developed normally and apparently were free from any lung lesions.