Growing Returns

Selected tag(s): heat stress

Extreme heat puts pressure on cows and farmers

By Sukie Kevane, EDF InternBlack and white dairy cattle grazing from USDA.

Dairy and beef producers are feeling the strain of heat waves — and so are their animals. Longer, hotter summers are making it harder for cows to stay healthy and productive. Heat stress lowers milk yields, weakens cows’ immune systems and can even threaten fertility.

For farmers, the impacts go beyond animal health: heat stress reduces milk yields and fertility in cows, which translates directly into financial losses from lower production and higher management costs. Lower productivity also increases the methane intensity of any milk or meat produced.

But across the world, producers, veterinarians and nutritionists are responding with new tools and time-tested strategies to help livestock cope. These solutions matter not only for animal health, but for food security, rural livelihoods and climate resilience.

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The growing threat of heat for farmworkers

Farmworkers in field picking yellow squash outside in the heat.

Dangerous health effects and heat-related illnesses result when the body is unable to maintain a safe core temperature through measures like sweating. Symptoms range from mild effects to severe illness and even death.

The summer of 2023 has been one of record-breaking heat with devastating consequences for people, crops and livestock. As the climate continues to warm, heat wave intensity, frequency and duration will increase across the globe.

U.S. farmworkers — invaluable, often unrecognized contributors to food production and the trillion-dollar agricultural economy — are at exceptionally high risk for heat-related health consequences. A report from Environmental Defense Fund and La Isla Network finds that the average U.S. agricultural worker is currently exposed to an estimated 21 unsafe working days due to heat each May-September. Crop workers are also 20 times more likely to die from heat-stress-related illness than civilian workers in the U.S.   Read More »

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