Consequences of too high temperatures in the barn

Symptoms of heat stress

In summer, the rising temperature and humidity can mean that cows are no longer able to release their body heat sufficiently. This results in heat stress, which has far-reaching consequences for the health and performance of the animals.
Here are some typical signs and their effects:

Increased breathing rate:
One of the first symptoms is the “pumping” of the animals and the increased breathing rate. This can intensify to the point of heavy panting with an elongated neck and open mouth.

Behavioral changes:
Cows suffering from heat stress are less likely to be found lying down as they try to increase the surface area exposed to a breeze.

Sweating and loss of minerals:
Sweating leads to a loss of important minerals. The consequences include

• Diseases such as mastitis
• Drop in performance
• Deterioration of the milk ingredients

Reduced feed intake:
The nutrient supply is impaired, with the consequences: Decrease in milk yield, decrease in fat content in the milk, risk of metabolic disorders such as ketosis

Increased water intake:
A cow needs about 1.2 liters more water for every 1 °C rise in temperature.

Reduced reproductive performance:

• Irregular cycles and reduced fertility
• Increased risk of premature embryonic death

Heat stress not only affects the health and well-being of cows, but also has an impact on milk production and reproductive performance. Cooling and stress reduction measures are therefore essential.