Innovative and Precise Cooling for the Hardworking Dairy Cow Edstrom cooling systems keep your herd comfortable, healthy, and productive – even through the hottest months of the year. It doesn’t have to be 110°F for heat stress to occur in dairy cows. Studies have found that dairy cows will begin to reduce feed intake and lose body weight at temperatures as low as 79°F. Milk production, reproductive performance and health are all affected. Heat stress affects performance even in seemingly cooler months, as cows struggle to rebound from complications such as rumen acidosis. High yielding cows are most susceptible to heat stress. All of this quickly impacts your profits! The degree of heat stress suffered by the cow will depend on the combination of environmental conditions – air temperature, relative humidity, air movement, and radiation from the sun. Dairy farmers use shades, fans, and ample fresh drinking water to help herds beat the heat, but often shade and ventilation are just not enough.