By Blake Jackson
Heat stress remains a major challenge for dairy producers, especially as rising temperatures and humidity make it harder for cows to regulate body heat.
According to Victor Cabrera, Professor and Dairy Systems Management Specialist at the University of Wisconsin-Madison Division of Extension, high-producing dairy cows are particularly vulnerable because their elevated metabolic activity generates additional internal heat.
When environmental conditions prevent adequate cooling, cows experience heat stress, which can lead to reduced feed intake, lower milk production, fertility issues, and greater health risks.
To help farmers evaluate solutions, the University of Wisconsin-Madison Dairy Management Program developed the Heat Abatement Investment Scouter.
This decision-support tool helps producers assess the financial return and payback period of investing in cooling systems such as fans and soakers, based on their specific farm conditions and regional climate.
A key concept behind the tool is the Temperature-Humidity Index (THI), which combines air temperature and humidity to measure heat load on animals. Research shows that dairy cows begin to experience stress at a THI of 68.
Each hour above this threshold can reduce milk output, with estimated losses of about 0.5 pounds per cow per hour for each unit increase in THI. Over time, these losses can add up significantly, particularly in humid regions where heat stress may occur for thousands of hours annually.
The tool uses historical weather data to estimate local heat stress conditions and simulates both cooled and non-cooled scenarios. It calculates potential production losses, operating costs, and expected financial gains from cooling investments.
Beyond immediate milk losses, heat stress can have lasting effects on production and herd health. By combining climate data with economic analysis, the tool helps farmers make informed decisions to protect productivity and profitability.
Photo Credit: gettyimages-peopleimages
Categories: Wisconsin, Education, Livestock, Dairy Cattle