Particle mapping in stables at an American Thoroughbred racetrack.

The research investigated the seasonal and regional concentration of different sizes of airborne particles in racehorse stables. The study highlighted the impact that varying factors such as stable design, time of day, and season have on the concentration and number of particles, providing invaluable data for managing potential health risks to horses.

Objectives and Methodology

The main aim of this research was to investigate differences in the concentration of airborne particles of various sizes in horse stables in different seasons (July, September, and November) and at different times of the day (early morning, midday, and late afternoon). The researchers used direct reading instruments to accurately measure these parameters. This monitoring took place across three different racing stables.

• The study aimed to identify if there were significant differences in particle concentrations between different stables, seasons, and times of day – primarily focusing on particles small enough to reach the lower airways of the horses.
• The research also assessed how the stable design and the exact location of the stall within the stable influenced the number and concentrations of airborne particles.

Results

• A key finding of the research was that particle concentrations were lowest in July and highest in September and November.
• The researchers also discovered that concentrations were significantly higher in the early morning compared to the rest of the day.
• Stable design played a substantial role – the enclosed stable with little natural ventilation was found to have significantly higher particulate concentrations than the open-sided stable.
• In relation to the size of particles, particles measuring between 2-5 µm were most abundant in July and least so in November, while particles measuring 0.5-1.0 µm were most present in September and least so in November.
• The location of the stall within the stable also affected concentrations and numbers of particles.

Conclusion

Airborne particle concentrations in racehorse stables vary according to stable design, season, time of day and the specific location of the stall within the stable. In essence, this means that certain environments pose a greater risk for horses to inhale particles that could potentially harm their respiratory health. The researchers concluded that particle mapping is a valuable tool for identifying stables, stalls, and seasons where horses might be at increased risk of exposure to harmful airborne particles.