Efficacy studies with three formulations of cambendazole in horses.

The research conducted an assessment of the effectiveness of three cambendazole formations (paste, pellets, and suspension) in comparison to thiabendazole treatment for quarter horses. The research findings revealed that all three presentations of cambendazole reduced strongyle egg output by at least 95%.

Background

• The study focused on comparing the efficacy of different drug formulations, specifically three forms of cambendazole and thiabendazole, for reducing strongyle and Parascaris equorum egg outputs in horses.
• Cambendazole and thiabendazole are both anthelmintic drugs, commonly used to treat parasitic worm infestations in horses and other animals.

Methodology

• The research was conducted in two experiments on 181 Quarter Horses of varying ages, both female and male (intact and altered).
• The effectiveness of the treatments was measured by the mean output of strongyle eggs. This was determined by the count of eggs per gram (epg) of horse feces pre- and post-treatment.
• The researchers also monitored for the presence of Parascaris equorum eggs, a common equine roundworm, particularly among the younger horses in the first experiment.

Findings

• All three formulations of cambendazole (paste, pellets, and suspension) successfully reduced the strongyle epg count by at least 95% compared to pre-treatment output and control group horses that were not medicated.
• Among the younger horses, 19 showed Parascaris equorum eggs. However, in post-treatment feces samples, these eggs were not detected in 14 horses treated with cambendazole.
• In horses treated with thiabendazole instead, post-treatment feces samples indicated the continued presence of Parascaris eggs. Out of five horses treated with this drug, two still had detectable Parascaris egg counts post-treatment.

Implications

• The study indicated a less efficient action of thiabendazole compared to the three cambendazole treatments. The indicated performance of cambendazole formulations suggests they may provide a more effective treatment approach for helminth infestations in equines, both for strongyle and Parascaris equorum worms.
• These results, however, may be preliminary, and further studies could be needed to fully understand any potential implications of drug resistance, side-effects, and long-term effectiveness.