Prepare for Heat Stress in Cattle

With warm weather in the forecast, cattle producers need to have a plan to lessen heat stress in their animals.

Heat stress has the greatest impacts when cattle are exposed to a combination of elevated temperatures and humidity for a period of time, according to North Dakota State University Extension Service animal experts. Hot and humid conditions during the day can stress cattle, but cooler temperatures at night will provide relief for cattle and equip them to face warmer daytime temperatures.

“If forecast models are correct, daytime highs in the upper Great Plains may be in the 80s to 90s, but the nighttime temperatures in the mid-60s should allow for nighttime cooling,” Extension livestock stewardship specialist and veterinarian Gerald Stokka says. “However, as we progress into the hottest part of the summer, a quick review of steps producers can take to manage and monitor conditions for heat stress is in order.”

Being proactive is the best way to deal with heat stress in cattle, he adds. To anticipate when heat stress conditions will be developing, actively monitor temperature and humidity forecasts.

“Once cattle are in a severe state of heat stress, you may be too late to help them,” Extension beef cattle specialist Carl Dahlen cautions. “Having a solid management plan in place to address heat stress could pay big dividends in the form of maintained animal performance during periods of heat and in avoiding death losses in severe cases.”

Heat stress occurs when cattle are not able to dissipate heat.

Mammals have involuntary methods of regulating their internal body temperature, including shivering and sweating to maintain “homeostasis,” or a constant, stable environment, Stokka says. Signs that animals are trying to maintain homeostasis include an increasing respiration rate, increased heart rate and increased panting. While animals are using extra energy, their feed intake declines.

Dahlen and Stokka recommend producers take the following steps to protect cattle from heat stress:

An action plan should include the following:

The U.S. Department of Agriculture has a heat stress forecast tool at http://www.ars.usda.gov/npa/marc/heatstress.
“Also, remember that interventions causing animals distress or to cool extremely rapidly could have disastrous consequences,” Stokka says.

For more information about dealing with heat stress on beef cattle operations, see an NDSU Extension publication at http://tinyurl.com/beefheatstress.

Source: Carl Dahlen, Gerald Stokka, and Ellen Crawford, North Dakota State University 

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