1. Bronchopneumonia in Cattle
Bronchopneumonia is one of the most common respiratory diseases in cattle. It occurs when bacteria, viruses, or other infectious agents cause inflammation of the bronchi and lung tissue. Stress factors such as weaning, transportation, overcrowding, poor ventilation, sudden weather changes, and weakened immunity increase the risk of the disease.
Affected cattle may show fever, depression, loss of appetite, coughing, nasal discharge, rapid breathing, and difficulty breathing. Lung sounds such as crackles and wheezes can often be heard during auscultation. In severe or untreated cases, pleuritis, lung abscesses, poor weight gain, and even death may occur.
Diagnosis is based on clinical signs, lung auscultation, ultrasonography, necropsy findings, bacterial culture, and PCR testing. Early diagnosis and prompt treatment with appropriate antimicrobials and supportive therapy are essential for a successful outcome.
Prevention includes good ventilation, stress reduction, proper nutrition, biosecurity measures, vaccination programs, and early identification of sick animals. Effective management practices play a key role in reducing the incidence and economic impact of bronchopneumonia in cattle.
2. Lobar Pneumonia in Cattle
Lobar pneumonia is a severe form of pneumonia in which a large portion or an entire lobe of the lung becomes inflamed and consolidated. In cattle, it is commonly associated with bacterial infections, particularly Mannheimia haemolytica, and is often a component of Bovine Respiratory Disease (BRD).
The disease usually develops after stress, transportation, weaning, overcrowding, poor ventilation, or viral respiratory infections that weaken the animal’s natural defense mechanisms. As bacteria multiply within the lungs, they produce toxins that cause extensive inflammation, tissue damage, and accumulation of fluid and fibrin within the affected lung lobe.
Clinical signs include high fever, depression, loss of appetite, rapid and difficult breathing, coughing, nasal discharge, and reduced productivity. In severe cases, affected cattle may stand with their head and neck extended to ease breathing and may show signs of respiratory distress.
At necropsy, the affected lung lobe appears firm, dark red to gray, and consolidated. Fibrin may be present on the pleural surface, and pleuritis is commonly observed.
Diagnosis is based on clinical examination, lung auscultation, ultrasonography, necropsy findings, bacterial culture, and PCR testing. Early treatment with appropriate broad-spectrum antimicrobials and supportive therapy is essential to improve recovery and reduce losses.
Prevention relies on good herd management, minimizing stress, maintaining proper ventilation, implementing vaccination programs, and early detection and treatment of respiratory disease.
3. Chronic Pneumonia in Cattle
Chronic pneumonia is a long-lasting lung infection that develops when acute respiratory disease is not completely cured or when cattle are repeatedly exposed to infectious agents and stressful conditions. The disease causes persistent inflammation and damage to the lungs, resulting in reduced growth, poor performance, and economic losses.
Common causes include Mycoplasma bovis, Mannheimia haemolytica, Pasteurella multocida, and other bacterial pathogens associated with Bovine Respiratory Disease (BRD). Poor ventilation, overcrowding, transportation stress, and inadequate treatment of earlier respiratory infections can contribute to the development of chronic pneumonia.
Affected cattle often show a chronic cough, intermittent fever, nasal discharge, increased respiratory effort, poor weight gain, rough hair coat, and reduced feed intake. In severe cases, lung abscesses, pleuritis, and permanent lung damage may occur.
Diagnosis is based on clinical examination, lung auscultation, ultrasonography, radiography where available, bacterial culture, PCR testing, and postmortem findings. Chronic cases may be difficult to treat because irreversible lung damage and abscess formation can develop.
Treatment usually involves appropriate antimicrobials, anti-inflammatory therapy, supportive care, and improved management practices. However, animals with severe chronic lung damage may have a poor prognosis and may need to be culled.
Prevention focuses on early detection and treatment of respiratory disease, proper vaccination programs, good ventilation, stress reduction, adequate nutrition, and strong biosecurity measures.
4. Drenching Pneumonia in Cattle
Drenching pneumonia, also known as aspiration pneumonia, occurs when liquid medications, water, milk, or oral drenches accidentally enter the lungs instead of the stomach. This usually happens when drenching is performed incorrectly, animals struggle during administration, or large volumes of liquid are given too quickly.
The presence of liquid in the lungs causes irritation, inflammation, and bacterial infection, leading to pneumonia. Affected cattle may develop coughing during or shortly after drenching, fever, rapid breathing, difficult breathing, nasal discharge, depression, and loss of appetite. In severe cases, animals may show respiratory distress and sudden death.
Diagnosis is based on a history of recent drenching, clinical signs, lung auscultation, ultrasonography, and response to treatment. Early treatment is important and may include broad-spectrum antibiotics, anti-inflammatory drugs, and supportive care.
To prevent drenching pneumonia, animals should be properly restrained, drenches should be administered slowly, and the drenching nozzle should be placed carefully to ensure the liquid is swallowed normally. Excessive force should never be used during oral administration of medications or fluids.
Key Points
5. Traumatic Pneumonia in Cattle
Traumatic pneumonia is a lung infection that develops when foreign material such as milk, feed particles, drenches, medicines, rumen contents, or other substances accidentally enter the respiratory tract and lungs. This condition is commonly referred to as aspiration pneumonia and can result in severe inflammation and bacterial infection of the lungs.
Traumatic pneumonia may occur after improper drenching, force-feeding, incorrect administration of oral medications, swallowing disorders, recumbency, or diseases affecting normal swallowing reflexes. Once foreign material enters the lungs, it damages lung tissue and creates an environment that allows bacteria to multiply rapidly.
Affected cattle often show fever, depression, loss of appetite, coughing, nasal discharge, difficult or rapid breathing, and abnormal lung sounds on auscultation. In severe cases, respiratory distress, lung abscesses, toxemia, and death may occur.
Diagnosis is based on the animal’s history, clinical signs, lung auscultation findings, ultrasonography, radiography (when available), and postmortem examination. Treatment usually involves broad-spectrum antibiotics, anti-inflammatory drugs, supportive care, and correction of the underlying cause.
Prevention includes careful drenching techniques, proper administration of oral medications, avoiding force-feeding, and ensuring that debilitated animals are managed appropriately to prevent aspiration of feed or fluids into the lungs.
6. Parasitic Pneumonia in Cattle
Parasitic pneumonia, also known as lungworm pneumonia, is a respiratory disease of cattle caused mainly by the lungworm Dictyocaulus viviparus. The disease is most common in young grazing cattle, especially those exposed to contaminated pastures.
Cattle become infected by eating infective larvae while grazing. After entering the body, the larvae migrate to the lungs, where they mature into adult worms and cause irritation, inflammation, and damage to the airways. Severe infections can significantly reduce respiratory function and animal performance.
Common clinical signs include:
In severe cases, affected cattle may develop secondary bacterial pneumonia, respiratory distress, and even death.
Diagnosis is based on clinical signs, grazing history, detection of lungworm larvae in feces using the Baermann technique, and postmortem examination. Treatment usually involves appropriate anthelmintic drugs such as ivermectin, doramectin, eprinomectin, moxidectin, fenbendazole, or levamisole.
Prevention includes strategic deworming programs, good pasture management, avoiding overstocking, and vaccination where available. Early detection and treatment are important to minimize economic losses and improve animal health.
7. Pleuropneumonia in Cattle
Pleuropneumonia is a severe respiratory disease characterized by inflammation of both the lungs (pneumonia) and the pleura, the membrane surrounding the lungs. It commonly develops when bacterial infections spread from the lung tissue to the pleural cavity, resulting in extensive inflammation and accumulation of fibrin and fluid.
Affected cattle often show high fever, depression, loss of appetite, rapid and painful breathing, coughing, nasal discharge, and reduced productivity. In severe cases, animals may grunt during breathing, stand with an extended neck, and show signs of respiratory distress.
Common bacterial causes include Mannheimia haemolytica, Histophilus somni, Pasteurella multocida, and Mycoplasma bovis. Stress, transportation, overcrowding, poor ventilation, and viral respiratory infections can increase the risk of disease.
Diagnosis is based on clinical examination, lung auscultation, ultrasonography, necropsy findings, bacterial culture, and laboratory testing. Early treatment with appropriate antimicrobials and anti-inflammatory drugs is important to improve recovery and reduce complications.
Prevention involves proper herd management, good ventilation, minimizing stress, maintaining biosecurity, and implementing effective vaccination programs against respiratory pathogens.
8. Purulent Pneumonia in Cattle
Purulent pneumonia is a bacterial lung infection characterized by the accumulation of pus within the airways and lung tissue. It commonly develops when bacteria such as Pasteurella multocida, Histophilus somni, Mannheimia haemolytica, or Mycoplasma bovis invade the lungs, particularly after stress, viral infections, poor ventilation, or weakened immunity.
Affected cattle may show fever, depression, reduced feed intake, coughing, mucopurulent nasal discharge, rapid breathing, and respiratory distress. On auscultation, abnormal lung sounds such as crackles and wheezes may be heard. In severe or chronic cases, lung abscesses, pleuritis, weight loss, and poor performance can occur.
Diagnosis is based on clinical examination, lung ultrasonography, necropsy findings, bacterial culture, and PCR testing. Early treatment with appropriate antimicrobial therapy and supportive care is essential to improve recovery and prevent permanent lung damage.
Prevention involves maintaining good ventilation, reducing stress, implementing vaccination programs, ensuring proper nutrition, and promptly identifying and treating affected animals. Effective herd health management is crucial for minimizing the occurrence and economic impact of purulent pneumonia in cattle.
Causes of Pneumonia in Cattle
Infectious Causes
Bacterial pathogens
Viral pathogens
Predisposing Factors
Clinical Signs (Symptoms)
Affected cattle may show:
Diagnosis
Diagnosis is based on:
Treatment
Antimicrobial Therapy
Commonly used antibiotics include:
The choice of antibiotic should be based on veterinary examination, local regulations, and, when possible, culture and sensitivity results.
Supportive Treatment
Prevention
Key Points