Without Antibiotic A. D. Ice, A. L. Grant, L. K. Clark, T. R. Cline, M. E. Einstein, and M. A. Diekman Departments of Animal Sciences and Veterinary Clinical Sciences Health and well-being of pigs may be markedly affected by management and environment in modern pork production units.
Environment is a complex composite of many factors and stressors interacting with one another.
Exposure to stress increases the animal s chance of being challenged by respiratory diseases. A are causative agents of chronic respiratory disease that result in decreased overall performance. Actinobacillus pleuropneumoniae and A. suis can be causes of chronic pneumonia, but usually are present as acute pneumonia. In addition, the effect of chlortetracycline on overall health and lean growth in both environments was tested. Each room was environmentally regulated with separate ventilation and flush pit manure disposal systems.