Exploring the possible functions of equine hoof wall tubules.

This research article explores the different possible functions of the tubules inside a horse’s hoof wall. The authors conducted tests on samples of hoof wall tissue, and found that the tubules do not play a significant role in hydrating the hoof, nor do they contribute to the hoof’s flexibility or ability to conduct heat. This suggests that the tubules might not have any functional role and their existence could be due to the biological processes that produce the hoof’s keratin fibres.

Methodology and Findings

• The researchers conducted hydration tests on blocks of hoof wall tissue. The purpose of these tests was to investigate the hypothesis that the hollow tubules in the hoof wall could facilitate the conduction of water vapour towards the end of the hoof.
• The results of the hydration tests showed that neither water loss nor gain was facilitated through the outer surface of the hoof wall.
• The researchers also found that the increase in surface area provided by the medullary spaces—the inner cavities of the hoof—did not contribute to hydration through the part of the hoof with exposed tubule ends.
• In fact, the presence of hollow tubules seemed to allow for a higher rate of dehydration through their exposed ends.
• The researchers also performed an analysis of the medullary space in the hoof, and found that these hollow areas did not significantly increase the flexural stiffness of the hoof, nor did they decrease its thermal conductivity.

Interpretation of Findings

• Based on the findings, the researchers suspect that the tubules within the hoof wall do not play any significant nonmechanical roles in the functionality or health of the hoof.
• As a result, they propose that the hollow nature of the tubules might not be an evolutionarily developed feature for a specific function. Instead, it might just be a byproduct of the biological process by which the body produces keratin fibres at steep angles relative to the crown, or coronary border, of the hoof.