Respiratory disease (bovine respiratory disease complex, BRD) is the most costly and welfare-significant disease in beef and dairy cattle, with vaccination programmes offering substantial welfare and economic benefits when properly implemented.
Bovine respiratory disease causes acute suffering through fever, respiratory distress, and systemic illness that without prompt treatment progresses to chronic lung damage and death. Cattle with BRD reduce feed intake, lose weight, and in severe cases show laboured breathing and open-mouth respiration. The pain and distress of pneumonia in cattle is comparable to that in other species — elevated cortisol, reduced activity, and social withdrawal are consistent signs. Vaccination represents one of the highest-welfare-impact interventions available in beef production: pre-weaning vaccination reduces disease incidence at weaning by 30-50%, and protocols that include vaccines before shipping prevent a significant proportion of the respiratory disease that kills hundreds of thousands of feedlot cattle annually. The economic case is equally compelling — antibiotic use, treatment labour, death losses, and reduced growth rates from BRD all have substantial costs that vaccination prevents at a fraction of the price. Farms with comprehensive vaccination protocols show markedly lower mortality rates and antibiotic usage than unvaccinated contemporaries.