Horowitz On OTTBs, Presented By Excel Equine: Understanding The Diet Of Thoroughbreds On and Off Track

If the expression “you are what you eat” holds true, then understanding what Thoroughbreds eat, particularly the diets that are necessary for their success both on and off the racetrack, will give us better insights into how we can relate to them and what their responses are to what we ask them to do.

Given that most Thoroughbreds attempt a racing career before embarking on another sport, let's start with the racetrack. A quick glance of a horse race compared to a show jump course, dressage test, or barrel race pattern suggests that racing is a relatively simple and straightforward activity. Run fast. And, if it's racing in the United States, run fast in a left-handed direction.

That's not the case.

“The Thoroughbred is such a unique individual,” Kent Thompson, the co-owner and managing partner of the Louisville, Ky.-based feed company Excel Equine said. “It can sprint four or five furlongs, but then you're asking that same exact breed to go out there and run a mile and a half. Two totally different types of exercise for performance.”

Even a horse that's exclusively a sprinter will occasionally train over longer distances, and route horses will do speed work.

With this understanding of the Thoroughbred breed, combined with an education that includes a Ph.D in animal science from the University of Kentucky and an ability to translate his knowledge into layman's terms understandable on a racetrack backside, Thompson and partner David Williams have grown Excel Equine from its founding in 2014 to feeding approximately 60 percent of the horses at their hometown track of Churchill Downs.

A lot of complex training goes into being successful on the track, similar to, for example, excelling at track and field or swimming in the Olympics. Both of those sports could theoretically also be reduced to “run fast in a left-handed direction” or “swim fast down and back.” Since racehorses are elite athletes, they require the nutrition of an elite athlete.

“It's not a hay-and-oats kind of situation anymore,” Thompson said. “There are some things you can do with something as simple as calories coming from fat or vitamins. Just because you've been doing it for years, it's a sport that's driven by so much tradition, and that includes nutrition. There are some things that you may want to consider doing differently.”

Thompson explains how faster-burning sources of energy like oats and corn can combine with slower-burning sources of energy like fiber and fat to meet the complex nutritional needs of racehorses.

“What you really look at is to provide them with various sources of energy to support that wide range of exercise levels we ask them to do,” Thompson said.

When horses finish their racing careers and embark on the next chapters of their lives, they require a different diet to match what they're being asked to do.

“They're still a performance horse, still have to meet some performance levels, but it's not that sort of high-performance exertion levels that a racehorse has,” Thompson said.

Thompson recommends adjusting a horse's diet slowly over 30 to 45 days. Cutting back grain and introducing turnout gradually. Feeding grain from typically three times a day on the track to two times a day off the track. From about 14 pounds on the track to about 10 pounds off the track.

“Let's pull some of those carbohydrate calories out and replace them with fat calories,” Thompson said. “It changes some of the circulating levels in a horse's body, and those hormones can be behavior-related.”

He also recommends treating retired racehorses for ulcers in light of the change in environment and work load they will experience. One way to do that, he says, is through alfalfa, which can act as a buffering agent thorough its fiber and calcium content.

As much as science goes into all of this, there's also an element of human, or equine, nature that goes into feeding horses because whatever you put in front of a horse, the horse gets to choose whether or not to eat it.

“The horse has to eat the feed,” Thompson said. “The fresher the feed, typically the better the horse eats it. And I would say our feed is more than likely the freshest feed on a racetrack, like at Churchill Downs for example. The cleaner the tub, that's what the trainer wants to see.”

I'd like to finish this column on a personal note and say how much of a pleasure it was to speak to Kent Thompson at Excel Equine. Their support has given me the opportunity to share stories about my adventures with OTTBs and to explore topics about the breed that are crucial to the success of the many equine sports industries in which the Thoroughbred features so prominently. It's been a fascinating source of personal growth to simultaneously be a voice for the breed to others while also learning about how enchantingly complicated these horses are.

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Microbiota Matters: Colic Duration And Lesion Location In Horses

In order to better understand the role of microbiota in the gastrointestinal tract of horses with colic, researchers observed changes at three key time points during a hospital stay to determine if population shifts were related to specific gastrointestinal disease.*

Seventeen horses admitted to a veterinary hospital for colic were used in this study. They represented a range of ages, from three years old to over 20. Other than one crossbred, all of the horses were Thoroughbreds or Warmbloods. Fourteen horses had colic signs for less than 60 hours and the remainder had signs for longer. Eight horses underwent surgery, and nine were managed medically.

Researchers collected fecal samples at the time of admission, one day after admission, and three days after admission (or at the time of discharge if beforehand). They measured the diversity and richness of bacterial species within microbiota populations.

The microbiota profile changed depending on the location and duration of the colic episode. “Several differences in bacterial phyla and genera were observed at different time points and with different types of colic,” according to the researchers. Specifically, horses admitted to the hospital with colic duration of more than 60 hours and large colon lesions have a distinct bacterial population compared to horses with colic duration of less than 60 hours and small intestinal lesions, including lower bacterial diversity and species richness.

Understanding the influence of the microbiota population as it relates to colic may one day help researchers solve the greater mystery of gastrointestinal disease. In the meantime, sound management practices will help keep horses safe from digestive dysfunction. Keep these management tips in mind:

  • Provide a source of clean water to horses at all times, being especially mindful to check waterers or outdoor water sources daily in all seasons.
  • Offer pasture, hay, or hay alternative for much of the day. When necessary, slow consumption by using a grazing muzzle, slow-feed haynet, or drylot.
  • Make changes in diet gradually, preferably over the course of 10-14 days. While many owners yield to this suggestion when switching concentrate, fewer do so with forage. Always acclimate horses to new forage slowly.
  • Furnish as much turnout as possible, as stabled horses are sometimes more prone to colic than horses at pasture.
  • Use feed tubs or buckets whenever feeding off the ground, particularly in sandy areas.
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While most horses are sensitive to abrupt changes in diet, others feel the effects from even the slightest of changes. Targeted supplementation can help these horses transition more safely, according to Catherine Whitehouse, M.S., a nutritionist with Kentucky Equine Research.

“A high-quality product, such as EquiShure, stabilizes the pH of the hindgut during diet changes. When the pH stays consistent, the bacterial population remains vigorous. But, as the pH drops and the hindgut environment becomes more acidic, the bacterial population changes and loses efficiency,” Whitehouse explained.

*Stewart, H.L., D. Pitta, N. Indugu, B. Vecchiarelli, M.L. Hennessey, J.B. Engiles, and L.L. Southwood. 2021. Changes in the faecal bacterial microbiota during hospitalisation of horses with colic and the effect of different causes of colic. Equine Veterinary Journal 53:1119-1131.

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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Foal Patrol Presented By National Museum Of Racing And Hall Of Fame: A Playmate For Traveling Tiger’s Filly

Foal Patrol, an initiative of the National Museum of Racing and Hall of Fame, has partnered with the Paulick Report in Season 5 to bring you closer to featured mares and foals and to ask farm staff your questions about their care and management over the course of the season.

In this episode with Traveling Tiger and her 2022 Audible filly at Safari North at Pauls Mill Farm in Versailles, Ky., we ask Safari North's Deborah Ward, “How do you decide when the mare and foal go out with others, and with which pasture mates?” 

For a chance to have one of your questions asked in an upcoming Foal Patrol episode on the Paulick Report, email your question to foalpatrol@racingmuseum.net. Be sure to let us know if your question is for a specific Season 5 mare.

The new Season 5 Education Site provides a platform to respond to viewers' questions, share information about horse care and management from breeding through retirement, and spotlight efforts across the industry to provide the best possible care for Thoroughbreds before, during, and after their racing careers. In partnership with industry collaborators, we will add new content to the Foal Patrol Education Site for viewers of all ages from now through June at foalpatrol.com/education.

Your Stories gives viewers the chance to share photos of their own mares and foals, selfies with Foal Patrol's mascot, Smokey, and stories about what Foal Patrol means to them. Send your photos and stories to foalpatrol@racingmuseum.net for a chance to be featured on foalpatrol.com/education/your-stories.

Since its first season in 2018, people all over the world have engaged with Foal Patrol's live webcam series for a behind-the-scenes look at what daily life is like for in-foal mares and foals. Learn more about this season's lineup at foalpatrol.com and watch Recent Updates for Foal Patrol announcements, posts about featured Season 5 mares and foals, and updates on mares and foals from prior seasons.

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More Than 40 Horses Ill With EHV-1 At Maryland Farm

Meadowbrook Stables, an established barn in Montgomery County, Md., reported that the farm has had more than 40 horses become ill with “mild to moderate” neurologic EHV-1 symptoms.

Discovered on March 9, the first affected equine was a lesson pony named River which had to be euthanized on March 10 at the Marion duPont Scott Equine Medical Center in Leesburg, Va. 

The farm's owners are working closely with their veterinarian, have implemented biosecurity measures, and are quarantining and monitoring the 49 horses that remain on the farm. 

Three additional horses were sent to the clinic, but have since returned to the farm for treatment. The barn has been closed since March 10.

The Maryland Department of Agriculture (MDA) reports seven confirmed positive cases on the farm, but notes that additional cases may be confirmed. MDA policy states that farms are only required to report the first EHV-1/EHM case on a property. 

Read more at the Chronicle of the Horse

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