Investigation of hydration processes of the equine hoof via nuclear magnetic resonance microscopy.

The research explores how water is distributed in the horse’s hoof wall by using nuclear magnetic resonance microscopy. The study closely examines the changes in water distribution during hydration process.

Methods

• The researchers used four hoof wall specimens sourced from various parts of a healthy horse’s hoof — two from the dorsum (back), one from the lateral quarter (side), and one from the lateral heel regions.
• The selected hoof wall specimens were inspected using nuclear magnetic resonance (NMR) microscopy.
• The method involved taking proton density-weighted three-dimensional images.
• Through these sequential images, changes in water absorption were observed and assessed.

Results

• The inner zone of the stratum medium (middle layer of the hoof wall) was found to have higher signals compared to the outer zone, indicating a denser water distribution.
• Transverse images highlighted areas of high signal intensity, corresponding to the distribution of horn tubules (protein structures in the middle layer of the horse’s hoof).
• As water was absorbed, the increase in signal intensity started at the bottom of a specimen and extended upwards, maintaining the same distribution pattern seen prior to hydration.
• The corresponding areas of horn tubules displayed local maximum signals, while the intertubular horn (protein structures filling spaces between tubules) reflected minimum signal intensities. The relationship between these areas displayed an approximately linear distribution.

Conclusions

• Assuming that signal intensity reflects water content, the study found that hydration in the equine hoof wall occurs concurrently in the tubules and intertubular horn during water absorption.
• The study also found that the original water gradients were maintained throughout this hydration process.
• Importantly, the researchers suggest that this technique can be utilized to assess pathological changes in the hoof wall on the basis of its hydration properties.