Heat Stress in Livestock Begins Earlier Than Thought, New Research Warns
Published on 08/04/2026 at 18:14 | Redaktion boerse-global.de
The summer drought gripping much of Central Europe has pushed pasture-based animal farming to a breaking point. But the latest scientific findings suggest the danger threshold for cattle is far lower than many farmers assume — with measurable harm starting at temperatures most people would consider merely warm.
Blood markers reveal hidden damage at moderate temperatures
A study released on 3 August by the Research Institute for Farm Animal Biology (FBN) found that just seven days of moderate heat stress triggers detectable inflammatory and coagulation signals in the blood of Holstein cows. The trigger point is a temperature-humidity index (THI) of 76, which corresponds to roughly 28 degrees Celsius. For lactating cows, the threshold drops even further — to a THI of 68.
The researchers warn that heat suppresses the animals' immune response, leaving them more vulnerable to illness precisely when their bodies are struggling to cope. To put the water demands in perspective: a fully grown cow needs between 120 and 150 litres per day in hot weather just to keep its system functioning.
Authorities step up enforcement
In the Saxon district of Sächsische Schweiz-Osterzgebirge, veterinary offices reminded livestock owners in early August of their legal obligations. Cattle, sheep and horses kept on pasture must have continuous access to shade and fresh drinking water. Officials signalled that breaches would be pursued rigorously, with substantial fines on the table for those who fail to comply.
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Dried-up pastures force herd reductions
The scorched meadows have created a second crisis: feed scarcity. In Hesse, the farmers' association has launched a fodder exchange, allowing operations to list available land or search for feed until the end of September. Further south, in Upper Austria, record dryness has pushed many farms into selling off parts of their herds. The knock-on effect is brutal — cow prices are falling as supply surges, leaving producers with long-term financial wounds.
Swiss slaughterhouses are reporting exceptionally high throughput. Dairy farmers there are culling animals due to both the feed shortage and depressed milk prices. Livestock traders have urged staggered slaughtering schedules to prevent an even steeper price collapse. In response, several cantons have temporarily relaxed the mandatory grazing rules, acknowledging that farmers need flexibility when their fields have turned to dust.
Water restrictions and risks beyond the farm
The water shortage has now reached regulatory levels. The Paderborn district in North Rhine-Westphalia is banning the pumping of water from surface sources starting 6 August, with the prohibition running until 30 September. Violators face fines of up to 50,000 euros.
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The heat threat, however, extends well beyond livestock. Temperatures above 25 degrees put dogs, cats and rabbits at risk of heatstroke. Birds are especially vulnerable — unable to sweat, they enter significant distress at just 26 to 28 degrees, and face life-threatening conditions once the mercury hits 35. Experts recommend shade, damp cloths and access to bathing water as practical countermeasures for pet owners.
