Density and morphologic features of primary epidermal laminae in the feet of three-year-old racing Quarter Horses.

The research investigates the density of primary epidermal laminae (PELs) in different areas of a horse’s hoof, and how this relates to the overall shape and features of the hoof using the example of three-year-old racing Quarter Horses.

Background and Methodology

• The study aims to provide a quantification of the density of Primary Epidermal Laminae (PELs), key features integral to the structure of a horse’s hoof, along the hoof’s solar circumference, the part of the hoof that comes into direct contact with the ground.
• The research involves evaluation of forefeet from nine 3-year-old Quarter Horse cadavers, a specific breed used widely in racing.
• Data on hoof morphology and PEL, including their number, density, and distribution patterns around the hoof wall, were collected.
• The research further involves a histologic examination (examination under a microscope) of the tissues of the laminar junction.

Findings

• Results showed a consistent footprint between the left and right forefeet of horses as no significant differences were found concerning their gross hoof morphologic measurements.
• The estimated average number of primary epidermal laminae including those in the bar areas was around 551.
• The PEL density in the toe region of the hoof was significantly higher in comparison to quarter and heel regions of the hoof.
• Furthermore, the study found that PEL density was also higher on the lateral (outer) aspect of the foot compared to the medial (interior) aspect.
• Histologic examinations revealed unusual laminar morphology at the toe.

Conclusions and Implications

• The study has identified variations in the PEL density and morphology around the solar circumference of hooves in young racing Quarter Horses.
• Understanding these relationships between laminar density and gross hoof morphology could aid veterinarians and horse trainers in diagnosing and treating conditions that affect the hoof wall in horses.
• Such an understanding could possibly contribute to better care and performance strategies for horses, especially those participating in races and heavy workload activities.