Pneumonia in Sheep Flocks: Prevention and Rapid Response

Pneumonia is a major cause of mortality and suffering in sheep, particularly in housed lambs. Effective prevention and rapid treatment significantly reduce welfare impact.

Key Facts

Ovine respiratory disease complex involves multiple pathogens including Mannheimia, Pasteurella, Mycoplasma, and viruses
Housed lambs are at highest risk — poor ventilation and crowding increase transmission dramatically
Pneumonia can progress rapidly from subtle signs to death within 24-48 hours
Early signs include nasal discharge, coughing, increased respiratory rate, and depression
Vaccination against enzootic pneumonia and pasteurellosis is available and effective
Good housing ventilation is the single most important preventive measure

Welfare Considerations

Pneumonia causes significant respiratory distress — labored breathing, pain from inflamed lung tissue, and general systemic illness. Lambs with pneumonia rapidly lose condition and may become too weak to suckle, compounding welfare harm through malnutrition. The rapid progression means delayed treatment causes substantially worse outcomes. Welfare-centered flock management treats any respiratory symptoms as urgent, using clinical scoring to triage treatment priority. Housing design that provides adequate air exchange without cold drafts is the most cost-effective and welfare-effective prevention. Antibiotic treatment is most effective in the early stages of disease.

What You Can Do

Prioritize housing ventilation design to prevent respiratory disease in lambs
Train farm staff to recognize early signs of respiratory disease
Treat affected lambs within the first day of identifying illness
Implement vaccination programs against enzootic pneumonia and pasteurellosis
Monitor stocking density — overcrowding dramatically increases pneumonia risk