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Functional changes induced by necrotic laryngitis in double muscled calves
1Laboratory for Cardiopulmonary Functional Investigation, Faculty of Veterinary Medicine, University of Liège, Brussels, Belgium.
The Veterinary Record
|October 10, 1987
Summary
Necrotic laryngitis severely impairs calf breathing mechanics and gas exchange, leading to increased lung resistance and decreased oxygen levels. This respiratory distress hinders growth and increases susceptibility to pneumonia and fatigue.
Area of Science:
- Veterinary Medicine
- Respiratory Physiology
- Animal Health
Background:
- Necrotic laryngitis is a common respiratory syndrome in young cattle.
- The condition significantly impacts the respiratory system, but its precise effects on breathing mechanics and gas exchange are not fully understood.
Purpose of the Study:
- To investigate the effects of necrotic laryngitis on breathing mechanics and gas exchange in calves.
- To quantify changes in pulmonary resistance, lung compliance, and blood oxygen levels.
Main Methods:
- Studied five Belgian blue double-muscled calves (2-3 months old) with naturally occurring necrotic laryngitis.
- Measured total pulmonary resistance, dynamic lung compliance, work of breathing, and arterial oxygen tension.
- Compared results to reference values for healthy cattle.
Main Results:
- Infected calves showed significantly increased total pulmonary resistance and work of breathing.
- Significant decreases in dynamic lung compliance and arterial oxygen tension were observed.
- An increased ratio of inspiratory to expiratory viscous work suggested tracheal collapse during inspiration.
Conclusions:
- Necrotic laryngitis severely disrupts pulmonary function in calves.
- Impaired respiratory mechanics impede growth and predispose to secondary bronchopneumonia and respiratory muscle fatigue.
- Early diagnosis and intervention are crucial for managing this condition.