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Respiratory Disease Management in Livestock
Respiratory DiseaseWelfarePreventionManagement
Respiratory disease is one of the most significant causes of suffering in housed livestock across all species. A systematic approach to prevention, early detection, and prompt treatment dramatically reduces the welfare burden and economic cost of respiratory disease in commercial livestock enterprises.
Common Respiratory Conditions
- Bovine respiratory disease (BRD): Multifactorial; viruses plus secondary bacterial pneumonia. Highest risk at housing, weaning, and transport.
- Enzootic pneumonia (pigs): Mycoplasma hyopneumoniae causes chronic, low-grade respiratory disease significantly reducing growth rate and welfare.
- Ovine respiratory complex: Mannheimia haemolytica and Bibersteinia trehalosi cause acute fatal pneumonia in sheep; pasteurella is a common welfare and production cause of mortality.
- Infectious bronchitis, Newcastle disease (poultry): Viral respiratory conditions causing significant welfare harm in poultry.
The Welfare Dimension
Respiratory disease causes significant suffering: difficulty breathing, pain from pleurisy, reduced ability to feed, and systemic illness. Animals may conceal signs until disease is advanced. Early intervention reduces the duration and severity of welfare compromise — making surveillance essential.
Prevention Framework
- Vaccination: Core vaccination against key respiratory pathogens for the species and production system. Administered at appropriate timing relative to risk period.
- Housing: Adequate ventilation (minimum air changes per hour for species and stocking density), appropriate temperature, and reduced ammonia and humidity are critical preventive factors.
- Stocking density: Overcrowding increases pathogen load and stress-mediated immune suppression.
- Management: Minimising regrouping and other concurrent stressors during high-risk periods (weaning, housing, transport).
- Nutrition: Adequate vitamin E, selenium, and copper support immune function; deficiencies increase susceptibility.
Early Detection
Daily observation for respiratory signs: increased respiratory rate, coughing, nasal discharge, altered posture (elbows out in cattle), and reduced feed intake. Systematic scoring systems (DART for cattle) improve consistency and sensitivity of detection. Acoustic monitoring technologies are being developed for automated respiratory disease detection in pig and poultry systems.
Further Reading