Selected Acoustic Frequencies Have a Positive Impact on Behavioural and Physiological Welfare Indicators in Thoroughbred Racehorses.
Authors: Gueguen Léa, Henry Séverine, Delbos Maëlle, Lemasson Alban, Hausberger Martine
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Researchers at the University of Rennes investigated whether specific acoustic frequencies could improve both behavioural and physiological welfare in housed thoroughbred racehorses, building on evidence that certain sound frequencies influence emotional states in humans. Twelve racehorses were exposed to a commercial acoustic stimulus containing low frequencies, high frequencies, and music tuning frequencies played twice daily for three weeks in their home stalls, with behaviour and ten physiological parameters (including haematological markers) measured throughout and after the intervention period. The acoustic treatment produced measurable improvements: stereotypic behaviours decreased significantly, whilst time spent in recumbent rest and foraging increased; additionally, four of the ten physiological parameters showed positive changes during and after the playback phase, suggesting improved physiological status. These findings suggest a practical, non-invasive approach to reducing stress-related behaviours in stabled racehorses and potentially enhancing recovery from training, though the mechanism remains to be clarified and findings warrant replication in larger populations. For equine professionals managing high-performance horses, acoustic enrichment presents a promising complementary strategy to address the welfare challenges associated with intensive training and confinement.
Read the full abstract on PubMed
Practical Takeaways
- •Non-invasive acoustic enrichment using specific frequencies may reduce stress-related vices in stabled racehorses without requiring pharmaceutical intervention
- •Implementation of twice-daily acoustic stimulation is simple and low-cost, making it practical for commercial racing operations seeking welfare improvements
- •Monitor horses for behavioral and physiological responses, as effects appear measurable within a three-week intervention period
Key Findings
- •Commercial non-audible acoustic stimulus containing specific frequencies reduced stereotypic behaviors, yawning, and vacuum chewing in 12 thoroughbreds
- •Acoustic enrichment increased time spent in recumbent resting and foraging behaviors during three-week playback period
- •Hematological measures improved in 4 of 10 physiological parameters measured during and after acoustic stimulus playback