Managing outdoor respiratory disease in beef calves during summer — an often-overlooked welfare challenge.
Summer pneumonia in beef calves causes significant welfare impairment that is often compounded by delayed detection. Calves at pasture cannot be monitored as easily as housed animals — they may deteriorate rapidly from subclinical infection to severe respiratory disease or death between routine checks. The welfare of each missed case represents avoidable suffering.
The summer pneumonia complex involves similar pathogens to housed calf pneumonia but under different predisposing conditions. High ambient temperatures, fly worry causing stress, nutritional transitions, and co-mingling of calves from different sources create conditions for respiratory disease outbreaks. Individual calves that develop severe pneumonia experience the full welfare burden of high fever, laboured breathing, and systemic illness while their location at pasture delays treatment.
Prevention focuses on fly control (pour-on insecticides, fly tags), vaccination against respiratory pathogens, stress minimisation during turnout, and close monitoring of calf health including twice-daily observation during high-risk periods.