Quantitative morphology of the equine laminar junction in relation to capsule shape in the forehoof of Standardbreds and Thoroughbreds.

This research study analyzes the morphological differences in horse hooves, specifically focusing on Standardbreds and Thoroughbreds, to better understand how stress or strain effects hoof health and lameness.

Objectives and Methodology

• The primary goal of the research is to study the relationship between hoof capsule shape and the morphology of primary epidermal laminae (PEL), and to decipher how breeds with different hoof shapes display different patterns of correlation.
• The study involved 27 Standardbred and 25 Thoroughbred horses. The research group took seventeen separate measurements pertaining to capsule shape and three separate measurements related to PEL morphology (spacing, orientation, and curvature) from the right and left front hooves of the horses.
• The measurements were analyzed for any significant breed differences. Further, three distinct laminar variables (spacing, orientation, and curvature) were measured on each hoof for a sample of 25 PEL at 5 circumferential and 4 proximodistal locations.
• The research group also performed comparative analysis of the pairwise correlations of capsular and laminar measurements within each breed subset, and any significant correlations were mapped onto the 20 sampling sites.

Findings

• The study found significant differences in the hoof capsule shape between the two breeds, with a total of seven distinct measurements differing in a statistical significance and also in a multivariate test.
• Between the two breeds, significant variations in PEL in terms of orientation and spacing were observed predominantly at the medial quarters and heels, and curvature at both quarters.
• The study also found significant correlations between pairs of capsule and laminar variables at sample locations, which varied notably between the two breeds.

Conclusions

• The conclusions yielded by the research reaffirm the initial hypothesis that the laminar morphology and hoof capsule shape do, in fact, differ between Standardbreds and Thoroughbreds.
• The study also lends weight to the theory that remodelling of PEL can potentially be activated and guided by fluctuating levels of stress or strain at the laminar junction.
• By understanding the biological responses of hoof tissues to various types of stress, findings from this study may contribute to preventative measures against lameness in horses and maintain hoof health.