Bovine Respiratory Disease: Deep Welfare Guide

livestock

Bovine respiratory disease (BRD) is the most costly disease in the cattle industry worldwide and a major source of animal suffering. Prevention, early detection, and prompt treatment are welfare priorities.

Disease Complex Overview

Bovine respiratory disease (BRD), sometimes called pneumonia, shipping fever, or enzootic pneumonia, is a complex multifactorial disease involving multiple viruses (BRSV, BVD, IBR, PI3) and bacteria (Mannheimia haemolytica, Pasteurella multocida, Histophilus somni, Mycoplasma bovis). Stress (transport, weaning, mixing, environmental) predisposes cattle to infection. Young beef and dairy calves in the first weeks of life and newly arrived feedlot cattle are highest risk.

Welfare Consequences

BRD causes significant suffering: fever, rapid breathing, coughing, nasal discharge, depression, reduced appetite, and in severe cases respiratory failure and death. Affected cattle experience pain and distress. Chronic BRD causes permanent lung damage, reducing productivity and quality of life. Mycoplasma bovis infection causes particularly refractory pneumonia that does not respond to antibiotics, often requiring euthanasia. Inadequate or delayed treatment prolongs suffering.

Early Detection

Early detection is critical: treatment in the first 24-48 hours of illness is far more effective than late treatment. Clinical respiratory scoring systems (DART: Depression, Appetite loss, Respiratory signs, Temperature; BRD scorecards) provide structured approaches to identify affected cattle quickly. Daily health checks in high-risk groups, trained staff, and low treatment thresholds improve detection. Automated health monitoring technology (pedometers, reticulorumen boluses, automated feeding systems) can provide early warning.

Treatment

Antibiotics (tulathromycin, florfenicol, enrofloxacin, gamithromycin) are the mainstay of treatment. NSAIDs (meloxicam, flunixin) provide essential pain relief and reduce inflammation. Metaphylaxis (treating all animals in a high-risk group on arrival) reduces morbidity and mortality in feedlot settings but raises antimicrobial stewardship concerns. Treatment response should be assessed at 48-72 hours; non-responders require reassessment and possible antibiotic change.

Prevention

Vaccination against major viral pathogens (BRSV, IBR, PI3, BVD) reduces BRD severity and incidence. Intranasal vaccines provide rapid mucosal immunity useful at high-risk events (weaning, transport). Good colostrum management in calves is essential. Reducing stress (good mixing protocols, adequate feed and water, environmental temperature management, minimising transport time) reduces susceptibility. Biosecurity prevents introduction of new pathogens.