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Heat stress - preventing milk yield, fertility and health problems

High temperatures and high humidity in the summer can not only impact on the milk yield but also on the health and fertility of the cows. There are several things the farmer can do to prevent heat stress in the summer months.


Change behaviour

  • Ensure an adequate water supply and good air circulation.
  • Move grazing to the cool evening or night hours.


Ensure feed intake


Feed intake typically drops in the summer, so the animals also take in fewer nutrients.

  • Provide appetising components and high-quality rations.


Stabilise rations in the trough


Rations heating up in the trough is a major problem in summer and reduces declining feed intake even further.

  • Use acidifiers with a preservative effect.
  • Offer fresh feed more frequently.


Ensure a good energy supply


When a cow eats less, she takes in less energy. But thermoregulation significantly increases her energy requirement. When subject to heat stress the cow uses blood glucose, resulting in lower lactose formation and therefore lower milk yields.

  • Help your cows by providing energy boosters containing glucoplastic substances (e.g. propylene glycol and glycerin) and protected fats.

 Prevent rumen acidosis


Heavier breathing in hot temperatures leads to significantly higher CO2 excretions. As CO2 and bicarbonates are balanced at a certain level in the cow's metabolism, excretion of bicarbonates also increases, resulting in a shortage of these buffer substances in the rumen.


  • Stabilise the rumen pH value by using buffer substances and/or live yeasts.


Research & Developement

Devision Cattle

Phone + 49 4101 218-3000

Fax   + 49 4101 218-3199