Maryland And California EHV-1 Outbreak Update

The Maryland Department of Agriculture has confirmed a horse in Montgomery County tested positive for EHV-1 on March 9. 

The horse was sent to Equine Medical Center in Leesburg, Va., for treatment and was later euthanized because of complications. Two other horses from the farm were sent to the clinic for diagnosis and isolation, and are currently being treated. 

There were 44 horses in the barn on the index farm exposed to EHV-1. They are quarantined and possible links to the EHV-1 positive horses are being investigated. 

The California Department of Food and Agriculture (CDFA) has provided the following updates on the EHV-1 outbreak in California:  

Orange County Premise #1: 23 confirmed EHV-1 cases: two (2) EHM and 21 with fever only. 

Orange County Premise #2: 16 confirmed EHV-1 cases: two (2) EHM, 14 with fever and mild signs.

Orange County Premise #3: 20 confirmed EHV-1 cases; two (2) EHM, 18 with fever only. 

San Mateo County Premise #1: 40 confirmed EHV-1 cases; four (4) EHM, 36 fever only.

San Mateo County Premise #2 (original EDCC notification #2479): 3 confirmed (1 EHM, 2 fever)- no change 

Riverside County: 35 confirmed EHV-1 cases; three (3) EHM, 32 with fever only. 

Santa Clara County: two (2) confirmed EHM. One euthanized. 

CDFA is actively monitoring all situations.

For more information, visit the Equine Disease Communication Center.  

Click here for an EHM factsheet

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Retired Racehorses Fare Better Than Other Breeds In Behavior Study 

There are a plethora of preconceived notions surrounding racehorses and their ability to be quality riding mounts once they're done racing. At the forefront of these is the idea that most of them are not suitable for riding careers after racing. 

Assumptions about the breed include that retired racehorses are tough to retrain and that they exhibit undesirable behaviors; these can make it difficult for retiring racehorses to find homes.

Lillian Hellmann, with the Equine Genetics and Genomics Group at the University of Sydney, Australia, created a study to see if these stereotypes are warranted. The study polled both retired racehorse owners who use their horses in other disciplines and owners of other equine breeds. The survey questions centered on behavioral differences as seen by owners.

Data was received on 313 horses in 25 countries, including Australia, the United States and the United Kingdom. The horses fell into four main disciplines: dressage, eventing, recreational riding, and showjumping. 

The researchers found few significant differences in behavior between retired racehorses and those bred for other pursuits. When differences did occur, the Thoroughbreds were thought to behave more favorably. 

The team concluded that owners considered Thoroughbreds to exhibit more dominance and aggression that horses bred for other disciplines, but that their owners thought they were more social and had better self-control than other breeds. 

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The researchers suggest that the notion that retired racehorses are more difficult could be because they retire from racing at such an early age, and that their youth makes them more exuberant and inexperienced rather than their breed making them dangerous. 

They conclude that though the study has shown there to be some differences in the behaviors of Thoroughbreds compared to other breeds, the idea that Thoroughbreds are unsuited for other disciplines based on their temperament and behavior is unsupported. 

Read the full study here

Read more at HorseTalk

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Rood & Riddle Equine Hospital Installs Standing Pet Scanner

Rood & Riddle Equine Hospital announced March 16 the installation of an equine positron emission tomography scanner at the Lexington, Ky. hospital.

A PET scanner is used for diagnostic imaging in select lameness cases and can be used in standing, sedated horses. It does not require general anesthesia.

The scans produce quantitative, three-dimensional, cross-sectional images that can help accurately pinpoint the location and severity of a problem. Any area on the limb from the foot to the carpus (knee) and tarsus (hock) can be imaged.

Two different types of scans can be performed. One looks at areas of increased bone metabolism and is useful to identify subchondral bone disease, signs of impending fracture, suspensory ligament attachment disorders, and osteoarthritis. The other looks at the overall tissue metabolism and is useful in cases of soft tissue injury or laminitis.

Rood & Riddle is the fourth location for this standing PET scanner for horses globally and is the site of the first installation at a private practice.

“We are excited to introduce this new technology for our patients,” said Dr. Katherine Garrett, Rood & Riddle's director of imaging. “PET scans will increase our ability to detect bony injury in horses, which will hopefully lead to improved outcomes.”

Orthopedic surgeon Dr. Larry Bramlage said: “We started with radiographs alone, and they depended on celluloid and silver ions for an image. Then, digital radiographs moved us forward in the quality of what we could see. Nuclear scintigraphy was the next step because we could image physiology, not just anatomy. Then, the three-dimensional imaging with computed tomography (CAT) scans and magnetic resonance imaging further expanded our capabilities. We have now moved forward to another level with PET scanning, which combines the physiology of nuclear medicine and the three-dimensional capabilities of CAT and MRI into a three-dimensional image of bone physiology. It can also look at the three-dimensional activity of some soft tissues. PET adds significantly to our imaging and understanding of the true status of the equine athlete.”

In 2015 Grayson-Jockey Club Research Foundation funded the first-ever research project that performed PET scans on equine athletes and followed that up with additional research funding in 2019. Now this new cutting-edge research will assist vets coast to coast in identifying lameness problems that are hard to locate.

“Grayson has been a longtime supporter of research on the efficacy of PET scans in diagnosing injuries in horses, and we are pleased to see a PET scanner installed at one of the premier equine hospitals in the world,” said Jamie Haydon, president of Grayson. “We are proud to have contributed to the development of a technology that will help countless horses at Rood & Riddle for years to come.”

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Beet Pulp As An Energy Source For Equines

Horses with high energy demands, such as performance horses and hard keepers, frequently require concentrates to meet athletic expectations and to maintain condition. If you're looking to decrease the amount of high-starch concentrates, offering beet pulp can offset the need for cereal grains while supporting a healthy gastrointestinal system.

Offering concentrates fills the gap in many horse's diets when hay alone provides insufficient calories. In some cases, the starch content of traditional sweet feeds and straight cereal grains can exceed 40 percent in a horse's diet, potentially resulting in digestive disorders when fed at high intakes.

Some horses fed these types of diets may require gastrointestinal support due to the possibility of gastric ulcerationhindgut acidosis, and even laminitis.

“Nutritional supplements containing digestive buffers help attenuate the risk of acidosis due to starch fermentation in both the stomach and hindgut. Kentucky Equine Research has several products designed to deliver high-quality ingredients with significant buffering capacity to support total digestive tract health and function,” said Catherine Whitehouse, M.S., a Kentucky Equine Research nutritionist.

To maximize gastrointestinal health while supplying adequate calories to hard-working horses, nutritionists recommend limiting the amount of starch. Even when carefully supplied, some horses cannot tolerate this amount of starch in their diet. To add calories and offset the amount of starch fed, owners can offer vegetable oil or stabilized rice bran. If stabilized rice bran does not work for a particular horse, owners can try another “concentrate-sparing” feedstuff, beet pulp, though stabilized rice bran contains 50 percent more energy than beet pulp.

In terms of hindgut health specifically, beet pulp recently proved valuable in limiting hindgut dysbiosis that can occur with diets rich in starch and other soluble carbohydrates.* Dysbiosis refers to an alteration in the type and amount of bacteria in the intestinal microbiome that may lead to disease.

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In the study, different diets were fed to horses. The beet pulp diet involved 50 percent hay, 21 percent barley, and 29 percent beet pulp, while the high-starch included 55 percent hay and 45 percent barley.

When horses were fed the diet with beet pulp, the cellulolytic bacteria in the intestinal microbiome were more numerous than in horses on the high-starch diet; these beneficial bacteria break down fiber. In addition, horses fed beet pulp also produced higher concentrations of volatile fatty acids than horses fed the high-starch diet. Volatile fatty acids produced by bacteria in the hindgut are the primary source of energy for horses.

These results suggest that replacing even a portion of the concentrate with beet pulp can limit hindgut dysbiosis without affecting energy supply. This reinforces the reality that many feeds formulated for hardworking horses contain multiple energy sources, including starch, fat, and fermentable fiber. One of the most oft-used fermentable fibers is beet pulp.

*Grimm, P., V. Julliand, and S. Julliand. 2021. Partial substitution of cereals with sugar beet pulp and hindgut health in horses. Journal of Equine Veterinary Science 100:103530.

Reprinted courtesy of Kentucky Equine Research. Visit ker.com for the latest in equine nutrition and management, and subscribe to Equinews to receive these articles directly.

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