Abstract: Foot stance in grazing significantly influences hoof conformation and development from foal to yearling age. Objective: To conduct a longitudinal study to establish if the relationship between motor laterality and uneven front feet persisted in 3-year-old horses at the time of studbook selection and to investigate if such laterality and unevenness might influence the horses' ability to perform symmetrically while trotting, cantering and free jumping. Methods: Seventeen clinically sound but untrained (with only minimal experience of handling) and sound Warmblood horses that had participated in a previous study were assessed as per the protocol reported. Laterality was tested in a preference test (PT) and z-values were calculated for analysis purposes. Laterality and hoof unevenness were related to both relative limb length and relative head size, while the ability to perform symmetrically was tested in free trot-canter transitions and free jumping exercises. Differences in performance between horses with and without a limb preference in the PT and those with 'uneven' and 'even' feet were tested for differences in performance metrics using Students' t test, while linearity was tested using a regression analysis (P<0.05). Results: Significant laterality was still present in 24% of the 3-year-old horses and the relationship between laterality and uneven feet pairs was stronger than at foal and yearling stages. Horses with significant motor laterality had almost 4 times more unevenness, a smaller head and longer limbs and the relationship between body conformation and laterality was still present. There was a strong linear relation between unevenness, laterality and a bias or side preference for trot-canter transitions. However, this relationship was not significant during the free jumping exercise. Conclusions: Motor laterality and uneven feet pairs were still present and significantly related in the 3-year-old horses and both variables were also strongly related to sidedness in trot-canter transitions. Conclusions: Warmblood studbooks should include quantitative data on laterality at the time of studbook admission as part of the selection criteria.
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The research suggests that in young mature Warmblood horses, unevenness in front feet and laterality (or favouring one side) in movement affect their athletic performance, specifically in trotting, cantering and free jumping.
Objective of the Study
The goal of this research was to perform a longitudinal study to understand whether uneven front feet and motor laterality (preference for one side when moving), observed in Warmblood horses at 3-years-old, influence their ability to perform symmetrically in athletics like trotting, cantering, and free jumping.
Methods
Seventeen clinically sound but untrained Warmblood horses that had participated in a previous study were assessed.
The horses’ laterality was tested in a preference test, and z-values were calculated for analysis.
Laterality and hoof unevenness were compared to both relative limb length and relative head size.
The horses’ ability to perform symmetrically was tested in free trot-canter transitions and free jumping exercises.
Performance differences between horses with and without a limb preference and between ‘uneven’ and ‘even’ feet were analysed using a Students’ t test.
For testing the linearity, regression analysis was utilised.
Results
Significant laterality was found in 24% of the 3-year-old horses, and the relationship between laterality and uneven feet was stronger than in their earlier life stages.
Horses with significant motor laterality had almost 4 times more unevenness, smaller heads, and longer limbs.
A strong linear relation was found between unevenness, laterality and a bias for trot-canter transitions.
This relationship, however, was not significant during the free jumping exercise.
Conclusions
The study concluded that motor laterality and uneven feet were still a presence and significantly related in 3-year-old horses.
Both these variables had a strong correlation with sidedness in trot-canter transitions.
The researchers recommend including quantitative data on laterality at the time of admission into Warmblood studbooks as a part of the selection criteria.
Cite This Article
APA
van Heel MC, van Dierendonck MC, Kroekenstoel AM, Back W.
(2010).
Lateralised motor behaviour leads to increased unevenness in front feet and asymmetry in athletic performance in young mature Warmblood horses.
Equine Vet J, 42(5), 444-450.
https://doi.org/10.1111/j.2042-3306.2010.00064.x