Oral Lesions in the Bit Area in Finnish Trotters After a Race: Lesion Evaluation, Scoring, and Occurrence.
Authors: Tuomola Kati, Mäki-Kihniä Nina, Kujala-Wirth Minna, Mykkänen Anna, Valros Anna
Journal: Frontiers in veterinary science
Summary
Soft tissue trauma in the bit area affects the vast majority of harness racing horses, yet remains poorly characterised in the scientific literature. Finnish researchers examined 261 trotters (Standardbreds, Finnhorses, and ponies) immediately post-race using direct visual inspection and palpation, developing a standardised scoring system that categorises lesions by type, size, depth, and chronology to enable consistent assessment across equestrian disciplines. The findings are striking: 84% of horses presented with acute oral lesions, with only 16% entirely lesion-free; whilst 20% exhibited severe injuries, a further 43% showed moderate damage to the bars, commissures, buccal mucosa, tongue, or palate. Crucially, external bleeding occurred in just 2% of cases, yet 5% had blood visible on the bit itself—a sobering reminder that the absence of extraoral haemorrhage masks significant mucosal injury. For practitioners involved in harness racing welfare, this research underscores the need for systematic post-exercise assessment and highlights that bit-related trauma is not an incidental finding but an endemic problem warranting immediate attention to bit fit, pressure distribution, and rein handling techniques.
Read the full abstract on PubMed
Practical Takeaways
- •Routine post-race oral inspection is essential in harness racing, as the vast majority of trotters sustain bit-related mouth lesions that may not be visible externally
- •Absence of visible bleeding does not indicate absence of injury—check the bit itself and inside the mouth systematically after each race
- •Use the presented scoring system to track lesion severity trends in your training and competition program, identifying problem bits, fitting issues, or handling techniques that cause unnecessary trauma
Key Findings
- •84% (219/261) of trotters examined had acute oral lesions in the bit area after racing
- •43% of horses had moderate lesions, 20% had severe lesions, and only 16% had no lesions
- •5% of horses (13/261) had blood on the bit despite no visible external bleeding, indicating internal injuries may be underestimated
- •A standardized lesion scoring system was developed based on size, type, age, and depth of lesions for comparative research