EnglishFever in cows: signs and normal body temperature
A healthy cow’s body temperature is usually around 38–39.5 °C. A temperature clearly above this range is considered a fever and is the first sign of most infections. Because fever can begin before signs such as loss of appetite and a drop in milk, continuous temperature monitoring enables early intervention.
What is a cow’s normal body temperature?
The normal body temperature of an adult cow is usually around 38–39.5 °C. In calves it can be slightly higher. Ambient temperature, activity, feeding and the time of day all have a small effect on body temperature, so knowing each cow’s own normal gives the most accurate assessment.
Signs of fever in cows
- Reduced feed intake or loss of appetite
- Sudden drop in milk yield
- Dullness, standing apart from the herd, reduced movement
- Rapid breathing, nasal discharge
- Reduced rumination
- Hot ears and a dry muzzle
These signs are often noticed hours after the fever has started. Continuous temperature monitoring shows the rise as soon as it begins.
Common causes of fever in cows
- Mastitis: Inflammation of the udder
- Metritis: Uterine infection, especially in the first days after calving
- Respiratory diseases
- Other infections and injuries
Always consult your veterinarian for diagnosis and treatment.
How is fever measured?
The traditional method is measuring each cow with a rectal thermometer. It is accurate, but it only shows the moment of measurement and takes time in large herds. A rumen bolus measures continuously, so a fever that starts at night or at the weekend is not missed either.
Drinking and temperature measurement
When a cow drinks, rumen temperature drops temporarily and soon returns to its previous level. A good monitoring system distinguishes these drops from illness and does not give false alerts.
The benefit of detecting fever early
Detecting fever early means starting treatment sooner, losing less milk and better animal welfare. Edell Biosense picks up temperatures above the cow’s own normal and instantly alerts the herdsman, farm owner and veterinarian. You can also follow the course of treatment on the graph in the app.
Frequently asked questions
What is a cow’s normal body temperature?
In adult cattle it is usually around 38–39.5 °C; each cow’s own normal differs slightly.
How can you tell if a cow has a fever?
Loss of appetite, a drop in milk, dullness and rapid breathing are common signs. For certainty, take the temperature and consult a veterinarian.
Can fever be detected before signs appear?
Yes. Fever often begins before visible signs; systems that measure continuously, such as a rumen bolus, show the rise early.
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