When the weather turns hot and humid, cows quietly pay the price. Heat stress lowers feed intake, milk yield and fertility, and leaves animals more vulnerable to other health problems. Because it builds gradually, it is easy to miss until the bulk tank tells the story.
Spotting heat stress early
Watch for faster breathing or open-mouth panting, drooling, crowding around water and shade, less cud-chewing, and a drop in milk. Humidity matters as much as temperature — cows can struggle on a muggy day that doesn't feel extreme to us.
Reducing the heat load
- Shade over feed, water and loafing areas
- Good airflow and fans where cows gather
- Abundant, clean, cool drinking water — demand rises sharply in heat
- Feeding at cooler times of day to keep intake up
- Avoiding handling and movement during the hottest hours
Helping cows recover
After hot spells, supporting appetite, hydration and condition helps cows bounce back — best done under veterinary guidance. Transition cows and animals already under stress deserve extra attention, as heat compounds their existing challenges.
On a hot afternoon, shade and water do more for the milk cheque than almost anything else.
Plan for heat before it arrives. A few well-placed changes to shade, airflow and water can protect yield, fertility and welfare right through the hot season — your veterinarian can help prioritise for your setup.
