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Bit-Related Injuries In Harness Racehorses

Selecting and fitting a bit to an individual horse and then using it skillfully and sympathetically serve as hallmarks of nuanced horsemanship, no matter the discipline. When mouth injuries directly related to bitting occur, even the most conscientious of horsemen are often baffled by their appearance. Researchers attempted to pinpoint the root cause of these injuries in a recent study of harness racehorses.^* Should the blame be assigned to specific bits, other pieces of common equipment, or race performance?

Researchers examined the mouths of 261 trotters, including 151 Standardbreds, 78 Finnhorses (a native lightweight draft), and 32 ponies, for bruises and wounds immediately following a race. They looked at specific bit-contact areas: the inner and outer corners of the lips, bars of the lower jaw, cheek tissue near the second premolar tooth, tongue, and roof of the mouth.

The researchers then collected information about the type of bit used for each horse, making special note of the thickness and composition of the mouthpiece. Details of other equipment were taken, when applicable, including the use of an overcheck, jaw strap, or tongue-tie. Past racing history was mined from a reliable online database.

Injuries were observed in 84 percent of the horses in the study, regardless of the type of bit worn, and half of those were classified as moderate or severe. Five horses (2 percent) had visual blood outside of the mouth from the wounds.

Compared with horses wearing a single-jointed, half-cheek snaffle, trotters that wore a Crescendo bit, Mullen-mouth regulator bit, or a straight plastic bit had a greater likelihood of moderate or severe injury to the mouth. Bar lesions were more common in horses outfitted with unjointed bits. Other tack and race performance did not factor into risk for oral lesions, according to the researchers.

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“While this study serves to highlight the physical injuries caused by bits among specific high-performance horses, it is important to note that lesions may be severe enough to hinder comfortable chewing of forages, especially if hay or chaff is stemmy,” said Catherine Whitehouse, a nutritionist with Kentucky Equine Research. This in turn could affect forage consumption, leading to diminished body condition, onset of gastric ulcers, and loss of performance.

Further, mouth pain can be a source of worry or stress for horses, even while resting. “Racehorses have a high incidence of gastric ulceration, the effects of which can be assuaged by conscientious management, which may include the use of research-proven digestive supplements,” Whitehouse said.

^*Tuomola, K., N. Mäki-Kihniä, A. Valros, and A. Mykkänen. 2021. Risk factors for bit-related lesions in Finnish trotting horses. Equine Veterinary Journal 53:1132-1140.

Study: Tongue Lesions Common In Finnish Trotting Horses

A Finnish study has found that 83 percent of Standardbred racehorses and 90 percent of Finnhorse racehorses have tongue lesions caused by bits, reports The Horse.

The study used 261 racehorses on four Finnish tracks and found that 84 percent of the horses had moderate to severe mouth lesions. However, only 2 percent of the horses had blood that could be seen without opening the horse's mouth.

All horses at the track were required to have an exam when the horse finished racing. The research team classified the horses into four categories based on the number, extent and severity of bruising and open wounds in the horse's mouth,

Researcher Dr. Kati Tuomola concluded that all bits could cause mouth lesions, including unjointed bits and Happy Mouth (bits with a rubber-wrapped mouthpiece) bits, whether or not blood was apparent on the horse. Bit type is the most significant factor affecting mouth lesions, with the worst lesions associated with the single-joint Crescendo bit, which places pressure on small surface areas. Horses that were raced in mild, unjointed bits had lesions on the bars of their mouth.

The study team found no relation between the severity of lesions and the horse's race placings or if the horse broke stride. The team concluded that horses that race well aren't exempt from welfare concerns. The scientists also note that 16 percent of the study horses had no oral lesions, so it is possible to race without harming the horse's mouth.

Wild Parsnip Can Cause Painful Reaction In Horses, But Not For Common Reason

Researchers have recently discovered that wild parsnip can cause trouble for horses—even if they don't ingest it. Drs. Bryan Stegelmeier, Steven Colegate, Edward Knoppel, Kerry Rood and Mark Collett have found that the invasive weed, which is a member of the carrot family that can be found throughout the United States, can cause phototoxic reactions in horses, even if they don't eat it.

Photosensitive skin reactions often occur after a horse eats a plant with photodynamic compounds. These compounds can then found in the horse's skin and blood; when ultraviolet rays from sunlight strike a horse's pink skin, painful burns and blisters can occur.

The research team discovered that horses don't need to eat wild parsnip to have phototoxic reactions—they simply have to come in contact with the plant's sap. The sap contains furanocoumarins, which have been known to cause intense skin reactions in humans who come in contact with it on sunny days. The areas of the skin exposed to the sap may be sensitive to sunlight for up to two years after the original contact.

Study: Diet Change Imperative For Ulcer Resolution In Horses

When a horse begins ulcer treatment, the way he is managed is often scrutinized; alleviating stress will hopefully mitigate ulcer recurrence. A new study out of Denmark shows that management changes alone may not be enough—adjustment to the horse's diet should also be investigated.

A low-starch diet can be beneficial for a horse that has gastric ulcers, but diet as a whole is often overlooked when ulcers medication is prescribed. Dr. Nanna Luthersson created a study to highlight the necessity for diet adjustment.

Luthersson used 58 horses that were diagnosed with ulcers. The horses were divided into two groups based on the severity of their lesions: 24 horses had moderate lesions, graded as 1 or 2 out of 4, and 34 horses had severe ulcerations, determined to be a 3 or a 4. The horses were placed into pairs based on similarities in diet, feeding times, management and workload.

At the beginning of the study, the horses with severe ulcers were placed on omeprazole, but the other horses were not. Additionally, one horse out of each pair was put on a low-starch feed that was fed three times a day instead of twice a day.

After four weeks, the omeprazole treatment was stopped, but the assigned diets continued; researchers examined each horse with an endoscope and graded their lesions. Six weeks later (10 weeks after the study began), the horses again received endoscopic exams and had their lesions graded.

Horses with severe ulcers had a significant reduction in lesions between the start of the study and when the omeprazole ended. However, those horses that received the reduced-start diet sustained the lesion improvement for the entire 10 weeks. Horses that did not have their diets changed returned to their same lesions score by week 10 even though they had received the omeprazole treatment. This means that these horses received no long-term benefit from the omeprazole.

Luthersson concluded that adjusting a horse's diet is imperative for long-term management of a horse that is ulcer prone. Though some ulcers heal with diet change alone, she notes that treatment and diet change may necessary for horses with more-severe lesions.

Red more at EQUUS magazine.

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