Hoof Unevenness in Juvenile Quarter Horses During First 6 Months of Training.
Authors: Kawahisa-Piquini Gabriella, Bass Luke, Pezzanite Lynn M, Moorman Valerie J
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: Hoof Unevenness in Juvenile Quarter Horses During Early Training Hoof asymmetry is increasingly implicated in lameness development, yet little is known about how training initiation affects foot morphology in young performance horses. Kawahisa-Piquini and colleagues tracked 42 juvenile Quarter Horses (predominantly 2-year-olds) over six months of training, using inertial sensor systems to assess lameness alongside detailed hoof measurements including palmar angles, heel and toe geometry, and frog dimensions taken at baseline, two, four, and six months. Significant bilateral differences emerged by month six in both front and hind feet, with measurable asymmetries in toe angle, heel length, and heel angle—though notably, horses with uneven feet did not demonstrate higher lameness incidence than their symmetrical counterparts, and the degree of unevenness (high versus low foot) bore no relationship to lameness presentation in either limb pair. The practical implication remains nuanced: whilst hoof changes during early training are observable and measurable, the current evidence does not support that mild unevenness within a 1.5° threshold directly predicts lameness risk during this developmental period, though the study's limited sample size and lack of control group warrant cautious interpretation. Farriers and veterinarians should continue monitoring foot symmetry as part of regular assessment protocols, but may reassure owners that moderate asymmetries emerging during the first six months of training do not necessarily forecast performance-limiting lameness.
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Practical Takeaways
- •Monitor hoof measurements (particularly toe angle, heel length, and heel angle) during the first 6 months of training, as asymmetries commonly develop regardless of lameness occurrence
- •Hoof unevenness alone does not appear to predispose juvenile Quarter Horses to lameness, so trimming decisions should not be based solely on measurement asymmetry
- •Establish baseline hoof measurements before training starts to track changes and differentiate training-induced adaptation from pathological asymmetry
Key Findings
- •Hoof unevenness developed in toe angle, heel length, and heel angle by 6 months of training in both forelimbs and hindlimbs of juvenile Quarter Horses
- •No significant difference in lameness incidence was found between even-footed and uneven-footed horses in either forelimbs (P=0.64) or hindlimbs (P=0.09)
- •Distal phalanx palmar/plantar angles showed no difference between lame and non-lame forelimbs (P=0.54) or hindlimbs (P=0.20)
- •Training initiation caused measurable changes in hoof laterality measurements over the 6-month period, particularly in toe and heel parameters