Comparison of prevalence and strongyle egg counts per gram of feces in horses at pasture and in stables following ivermectin/praziquantel treatment.

The research article focuses on examining the impact of different horse management practices, particularly comparing stabled versus pasture-grazed horses, on the prevalence and parasite burden of equine strongyles (a type of worms) in South Korea. It also assesses the effectiveness of different schedules of deworming treatments in managing this parasitic infection.

Understanding the Research Objective and Methodology

• The research aimed to address the limited studies on the efficacy of deworming drugs and the management of parasitic infections, especially equine strongyle, in South Korea.
• In the study, 32 horses were given ivermectin/praziquantel, a common anthelmintic (deworming) drug, and were divided into groups based on their living conditions: pasture-grazed (16 horses) and stabled (16 horses). The groups were further divided based on how frequently they received deworming treatments (either every three to six months, or a more spaced out, nine to three months interval).
• To gauge the parasite load, researchers measured the Egg per Gram (EPG) count in the horses’ feces on a monthly basis, which essentially indicates the number of strongyle eggs present per gram of feces – a direct measure of the parasite burden.

Key Findings of the Study

• The study found that horses kept in stables had near-zero EPG levels throughout the year, indicating a lower risk of parasitic infection.
• On the other hand, horses grazing in pastures showed a significant increase and fluctuation in EPG levels, especially during the summer and autumn, suggesting a seasonal pattern of reinfection.
• The variation in deworming frequency did not significantly impact the EPG levels for stabled horses. However, pasture-grazed horses showed a higher risk of reinfection during the summer, indicating deworming every three months may be necessary.

Implications and Recommendations

• The research suggests that a standard three-month deworming schedule might be excessive for stabled horses due to their maintained low EPG levels and subsequently low risk of infection.
• However, this frequency appears to be adequate for pasture-grazed horses due to their higher reinfection rates and significant seasonal EPG fluctuations.
• The study emphasizes the importance of not just periodical deworming, but also suggests a targeted deworming approach based on regular monitoring of the EPG levels – as a more efficient and sustainable parasite control strategy. This will not only optimize the deworming treatments but also help mitigate the risk of the parasites developing resistance to the anthelmintic drugs over time.