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The in vitro anthelmintic activity on sheep gastrointestinal strongyle (GIS) eggs and larvae of 0.5% aloin and 0.1% aloe-emodin was investigated. From fresh faecal samples collected by ewes naturally infected by Haemonchus, Trichostrongylus and Teladorsagia nematodes, GIS eggs were isolated and cultivated in Petri dishes (100 eggs/dish). For the in vitro evaluation of the anthelmintic activity of tested compounds, the Egg hatch test (EHT), the Larval development test (LDT) and the Larval mortality/paralysis test (LMT) were used. In each assay, the activity of tested compounds was compared to untreated and treated (0.1% thiabendazole, TBZ) controls. Six repetitions were made through the experiment. Obtained data were statistically elaborated using the X 2  test. In EHT, 0.5% aloin gave highly significantly different (P&lt;0.01) results from the untreated controls. In LDT, both 0.1% aloe-emodin and 0.5% aloin almost completely prevented the larval development from L 1  to L 3 , showing no significant differences (P&lt;0.01) when compared to TBZ. In LMT, larval mortality observed in 0.5% aloin treated plates was significantly higher (P&lt;0.01) than that observed in TBZ treated controls. These results show the in vitro anthelmintic properties on sheep GIS of the examined plant secondary metabolites. In LDT and/or LMT, the activity of 0.5% aloin and 0.1% aloe-emodin was comparable to or higher than that of the reference drug.

In vitro Anthelmintic Activity of Two Aloe-derived Active Principles against Sheep Gastrointestinal Nematodes