Hot weather tips for pets and livestock

Dr. Minden Buswell
WSDA Veterinarian

As the summer heat rises, it's important to help
 your livestock stay cool.

Hot weather can reduce animals’ feed intake, growth, production, reproduction, welfare, and overall health. Each year the livestock and poultry industries lose billions due to livestock heat stress.

Here are a few tips and links to help keep your livestock and pets healthy during the summer heat.

Livestock heat stress: recognition, response, and prevention

According to this Washington State University Extension fact sheet, "Livestock Heat Stress: Recognition, Response and Prevention," keeping animals cool with shade, water on the skin, airflow and cool drinking water is important, especially if they show signs of heat stress. These warning signs include:

• Crowding around water tanks or shade
• Lethargy
• Poor appetite
• Increased respiratory rate
• Elevated heart rate
• Immobility or aimless wandering
• Drooling or slobbering
• Non-responsiveness
• Seizures
• Death

If you observe signs of heat stress, it's time to take action. To help cool them down, you should

1. Provide shade immediately.
2. Soak the animal's body with lukewarm to cool water.
3. Increase airflow around the animal using fans if possible.
4. Provide cool drinking water.
5. Minimize handling, transportation, and stress.
6. Call veterinarian for consultation.

A word about water

It may seem obvious that water requirements for livestock rise with the temperature, but some folks may not be aware of just how much more water animals need when it gets hot. According to information from University of Nebraska and University of Iowa extensions, water consumption when the temperature reaches 90 F can be almost twice what it is at 70 F.
Here’s a link to a useful fact sheet put out by the Iowa 4H.


Heat index:

 "Be prepared, even if the risk is several index units away. Additional
 solar heat, lack of air movement and heavy fat cover all can lead
 to disastrous effects of heat stress." NDSU Heat Stress Guide 

Many factors come into play when it comes to assessing the level of stress heat puts on animals. Physical workload, body weight, confinement and even hide color can all contribute to heat stress. For example, dark-hided animals are more susceptible to heat stress than their light-hided counter parts. But,  just like it does for people, humidity can really increase the discomfort on a hot day. As this table illustrates, the “feels like” factor should be taken into consideration, too.

Heat stress in cattle

With all that’s at stake, it pays to adopt a three-step plan for hot weather.

1. Learn how to identify the animals most at risk of heat stress.
2. Develop an action plan.
3. Know when to intervene.

North Dakota State University lays out a sensible approach to the problem in their brochure, "Dealing with Heat Stress in Beef Cattle Operations."

Visit WSDA's Animal Health Program webpage for other resources.

WSDA monitoring flock after waterfowl test positive for low pathogenic avian flu

Dr. Brian Joseph
Washington State Veterinarian

Washington State Department of Agriculture (WSDA) veterinarians detected a low pathogenic strain of avian influenza (LPAI H5) in a flock of waterfowl last weekend during a routine test of open class exhibition poultry at the Central Washington Fair in Yakima County.

Recent reports of these positive test results should not be cause for alarm. Although it’s always important to monitor flocks which have tested positive for an avian influenza strain, this low pathogenic strain is not the same as the HPAI H5N1 strain that makes people sick in other parts of the world. It is the strain of LPAI known to commonly circulate in North American waterfowl which does not readily infect chickens, although it can.

WSDA animal health specialists said this strain of
avian influenza is low risk for poultry and no risk to humans.

While it can potentially spread to domestic poultry or mutate into high pathogenic avian flu, we closely monitor any flocks that test positive for LPAI H5 or H7 to make sure we can respond quickly if circumstances change.

On Friday evening, Sept. 29, our veterinarians were notified that the duck flock from Lewis County tested positive for low pathogenic avian influenza. The owners were advised to remove their birds from the fair and return them to the home farm. They cooperated and removed the flock the next morning. WSDA also issued “stop movement” orders to prevent the birds from being moved and to reduce chances that the disease would spread.

Moving forward
WSDA has partnered with the U.S.Department of Agriculture (USDA) to develop a continued health plan for the flock. There will be no depopulation in this case, and state officials will conduct further testing on the flock 21 days after the first test.

To improve biosecurity and help prevent infection, we urge you to keep any domestic ducks in your flock, and their water sources, separate from your chickens and wild ducks.

If you have any questions, email ahealth@agr.wa.gov to reach our avian health specialists.