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Top tips to prevent heat stress in animals as temperatures expected to soar

As Britain is set to be hit by another heatwave over the bank holiday weekend, farmers have been urged to take precautionary measures to protect their stock against heat stress.

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Top tips to prevent heat stress in animals as temperatures expected to soar

June 2019 was officially recorded as the hottest June ever, and despite a wet start to this month, the Met Office has predicted temperatures to start to climb again this weekend.


Sarah Verity of Farmers and Mercantile Insurance Brokers (FMIB) urged farmers not to overlook the effect of rising temperatures and to monitor heat levels, take measures to keep animals cool, and look out for tell-tale signs such as lethargy, open-mouth panting, reduced food intake and agitation.


She said: “Farming is a weather dependent industry, acutely sensitive to temperature extremes, so the summer can be an extremely worrying and testing time of year for farmers.


“Of course, the well-being of the livestock is top priority for farmers, but it takes just a few extra degrees over a relatively short period of time for animals to suffer the effects of heat stress – it can happen quickly and without much warning.”


Many animals do not have the ability to dissipate enough heat to maintain homeothermy, so even what feels like a subtle increase in temperature can lead to death.

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Ms Verity said incidents last year included a farmer losing sheepdogs to heat exhaustion and 10 weaner pigs dying after heat stress triggered heart attacks.


Here, Ms Verity outlines her top tips on how to reduce heat stress:


Beef cattle

Cows out to pasture are not usually as susceptible to heat stress as those kept in sheds. However, working them during periods of extreme heat should be avoided; try to stick to early mornings.


Evenings should also be avoided as it can take cows six hours to bring their core body temperatures back down to normal after being exposed to extreme heat.


Cattle naturally produce a lot of heat whilst they are eating, and this peaks around four hours after feeding.


Therefore, cattle kept in sheds need to be fed earlier than usual to avoid their body temperatures peaking in the middle of the day.


Dairy cattle

Dairy cattle can start to experience mild heat stress from around 20°C.


Increased ventilation, fans, shade and sprinklers can all help with reducing body temperatures. These should be used in holding pens and milking parlours, as cows are under increased stress in these areas.


Access to water should be a given but intake is likely to double under heat stress. Make sure calves in huts or cows separated for rest have additional water, as these animals are more susceptible to heat stress.


An increase in moisture caused by excessive sweating can also lead to mastitis.


Pigs are much more sensitive to heat than other animals because they lack the ability to sweat.


Signs of stress in pigs include open-mouth breathing, vocalisation, blotchy skin, stiffness, muscle tremors and reluctance to move.


If pigs begin to demonstrate these symptoms, allow them to rest, keep them cool with fans and have access to plenty of water.


It can be helpful to sprinkle cool water onto the pig. Avoid pouring large amounts of cold water onto the pig, as this could cause shock.


Pigs housed outside need plenty of shade.



Sheep tend to be less susceptible to heat stress than other livestock. Wool protects sheep from extreme heat, as well as extreme cold.


Make sure sheep have been sheared and pay close attention for issues caused by flies.


During periods of extended heat and humidity, it may be necessary to provide extra water.



Poultry are highly susceptible to heat stress, and the first sign of this in the bird is panting.


To prevent overheating, keep sheds well ventilated, look to decrease the number of birds per square meter and keep water sources fresh and cool.


Birds produce heat whilst digesting food so look to feed birds during the cooler parts of the day. With broilers and turkeys remove feed from the birds around six hours before peak temperatures and reintroduce once it’s starting to cool.


Working dogs

Don’t forget about your working dogs during extreme heat.


Avoid working them during the peak of the day. Keep dogs in well-ventilated shade and with regular access to water. A shallow paddling pool is a fast way for a dog to cool down their body temperature.


Avoid taking dogs with you in the tractor or pick-up whilst temperatures are high.


If animals are displaying signs of heat stress, farmers are advised to seek veterinary help immediately.

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