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Heat Stress Slashes Dairy Milk Yields Worldwide

Jul 07, 2025
By Farms.com

Study Links Climate Heat to Long Lasting Milk Production Losses

A major new study confirms that climate change is hurting dairy production globally. Using data from over 130,000 cows in Israel, researchers found that humid heat causes up to a 10% daily drop in milk yields. The effects last over 10 days, even after temperatures cool.

The study focused on wet-bulb temperature, a measure that combines heat and humidity. It found that cows experience high stress when temperatures exceed 26°C, disrupting vital biological functions and milk output.

Even with advanced cooling systems in place, farms only recover half the milk lost at 20°C. At higher levels, cooling becomes less effective.

The study warns that nations like Brazil, Pakistan, and India could lose 4% in average milk yield per cow by 2050 without action.

Farmers benefit from cooling systems, which typically pay off in under two years. However, poorer farms may struggle to afford them, creating inequality in food production.

The researchers emphasize that beyond physical cooling, improving cow welfare is key. Reducing stress from confinement and calf separation helps cows withstand heat better.

As co-author Ram Fishman noted, “the severe impacts observed [in Israel] might be even more pronounced in less equipped regions.”

This research is one of the first to link real-time weather data with milk losses, offering a clearer picture of climate change’s effects on animals.

The study urges global investment in climate-smart agriculture, including breeding for heat tolerance and better policy support. Without action, the future of dairy farming—and a cold glass of milk—could be at risk.


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Drone Flight & Baling Success at Last!

Video: Drone Flight & Baling Success at Last!

Drone Flight & Baling Success at Last!

After weeks of rain delays and frustration, we finally have a reason to smile — it’s hay time again at Ewetopia Farms! In today’s episode, we head out to the fields where Arnie is baling hay, and I attempt my second drone flight to capture it all from the air. The drone still had some hiccups, but I managed to get some aerial footage of the baling process.

Back at the farm, the work doesn’t stop. Arnie brings the bales home, and the next critical step begins — wrapping and stacking the bales to make haylage. This process is essential for preserving feed for our sheep and ensures they have nutritious forage in the months ahead.

It’s a good day on the farm — the sun is out, the drone is flying (sort of!), and we’re making progress. Join us for a satisfying and productive day that brings a long-awaited sigh of relief to this year’s challenging hay season.

?? Let us know in the comments: Have you had to deal with weather delays this season?

?? Thanks for watching and supporting Ewetopia Farms — where every day is an adventure in sheep farming. Please like, comment, and subscribe to follow our daily journey with the flock!