Livestock

Enzootic Pneumonia in Calves: Welfare and Prevention

Welfare guide to enzootic pneumonia in young calves -- a persistent welfare challenge in calf-rearing systems.

Key Facts

Enzootic pneumonia is a complex multifactorial respiratory disease of calves under 5 months of age
It is the leading cause of calf mortality in the UK and causes significant chronic welfare deterioration
A complex of pathogens including RSV, PI3, BHV-1, Mannheimia, and Pasteurella are involved
Housing design is the single most important modifiable risk factor -- inadequate ventilation allows pathogen accumulation
The Wisconsin calf respiratory scoring system provides validated criteria for early clinical detection
Early treatment within 24 hours of first signs significantly reduces welfare impact and mortality
Vaccine protocols targeting key pathogens significantly reduce disease severity and mortality
Chronic pneumonia without clinical signs causes lung consolidation detected only at post-mortem -- a hidden welfare burden

Welfare Significance

Enzootic pneumonia causes enormous welfare harm across the calf rearing period. The visible acute disease is only part of the picture -- subclinical pneumonia causes lung damage that permanently impairs welfare and growth. Prevention through housing improvement, targeted vaccination, and rapid treatment response is the evidence-based welfare approach.

What You Can Do

Assess calf housing ventilation against published guidelines -- most calf housing has remediable ventilation problems
Implement systematic respiratory scoring of all calves using the Wisconsin scoring tool
Vaccinate against key respiratory pathogens using a programme developed with your vet
Treat identified cases within 24 hours using veterinary prescribed antibiotics -- do not delay