Age, breed, sex and seasonality as risk factors for equine laminitis.

This research sought to establish the influence of age, breed, sex, and seasonality on the likelihood of horses developing laminitis, a painful condition affecting their feet. The study determined that age and time of year can significantly impact the risk of chronic laminitis, but found no similar associations for acute laminitis or when considering horse breed or sex.

The conduct of the study

• The research was carried out at the Texas Veterinary Medical Center over a period of six years from 1986 to 1991.
• The tool used for analysis was logistic regression, a statistical method common for investigating relationships between a dependent variable (in this case, diagnosis of laminitis) and one or more independent variables (here, age, breed, sex, and seasonality).
• The data involved included 70 acute cases of laminitis, 183 chronic cases, and 779 control subjects. These control subjects were likely horses that came into the center for treatment unrelated to laminitis, providing a baseline reference for the analysis.

Findings and interpretation

• The research found no statistical association between age, breed, sex, or seasonality and the diagnosis of acute laminitis. This essentially means that, for acute cases, these factors do not significantly increase (or decrease) the likelihood of a horse developing the disease.
• However, in the case of chronic laminitis, conclusions were different. Age and the third quarter of the year (July-September) were found to be statistically significant risk factors. The odds ratio for age indicates that as the horse ages, the likelihood of chronic laminitis increases. The odds ratio for the third quarter suggests that cases of chronic laminitis are significantly more common during this period, as compared to the first quarter of the year (January-March).
• There was no statistical association found between the breed or the sex of the horse and the incidence of chronic laminitis. This means breed and sex do not appear to significantly influence whether a horse will develop chronic laminitis.

Conclusions

• While breed and sex do not have a significant impact on either acute or chronic laminitis, the age of the horse and the time of the year do influence the risk of chronic laminitis.
• More research might be needed to explore the reasons for this seasonal correlation, as well as to confirm the role of age as a risk factor in a larger population of horses or in different climatic conditions.