A non-lethal method for assessment of efficacy of antiparasitics against parasites in horses such as Anoplocephala perfoliata and Gasterophilus intestinalis.

The study presents a revised, non-lethal technique for evaluating the effectiveness of antiparasitic drugs in horses, particularly targeting parasites like Anoplocephala perfoliata and Gasterophilus intestinalis.

Introduction to the Problem

• The original procedure assessing the efficacy of antiparasitics against parasites in horses often requires the procurement of horses naturally infected with parasites. However, this approach presents two issues: the sourcing of naturally infected horses itself can be difficult and costly, and it typically requires an excessive number of horses to be slaughtered before significant data can be acquired.

Proposed Solution: Modified Critical Treatment Method

• To circumvent these problems, the researchers devised a new technique called the “Modified Critical Treatment Method”. This innovative method negates the need to sacrifice the horses, thereby making it a much more humane alternative.
• Instead of sacrificing the animals, this method relies on collection and examination of all fecal matter containing expelled parasites from tested animals. This non-lethal approach allows investigators to monitor the number of expelled parasites and evaluate the effectiveness of the test compound.

Evaluation of Efficacy

• Efficacy assessment is achieved by comparing the number of parasites expelled by the use of antiparasitic drugs with the total number of parasites eliminated by using both test and reference endectocides within the same horse. This method not only minimizes the number of animals used but it also allows for a direct comparison of the effects of the drug in the same animal, maximizing the reliability of the results.

Accessibility of Data Collection

• The development and implementation of the Modified Critical Treatment Method open a novel avenue for the collection of efficacy data. It enables the inclusion of farms that were previously unavailable for research, such as studs, thus broadening the scope of data collection and providing more diverse and representative samples.