Abstract
Infections of the gastrointestinal tract with parasitic nematodes, and particularly Haemonchus contortus, represent one of the main pathological constraints on the breeding of small ruminants in tropical countries. Owing to the constant development of anthelmintic resistance in worm populations, alternative control methods are being evaluat, including an assessment of the value of the traditional plants. The effect of the consumption of Fagara leaves on sheep infected with gastrointestinal nematodes was therefore measured both under controlled conditions and in a field survey. In sheep experimentally infected with 2500 third-stage larvae ofH. contortus, a three-day administration of Fagara was associated with a decrease in egg excretion and a significant reduction in the fertility of female worms, without changes in the worm number. A reduction in egg output was also confirmed from the results obtained of a survey on naturally infected sheep performed in smallholder farms. This survey also indicated that the repeated consumption of small amounts of Fagara leaves was more effective than a single three-day administration. Results of both studies suggest that Fagara leaves might be an alternative option to chemotherapy to modulate the epidemiology ofH. contortus in tropical countries.
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Hounzangbe-Adote, M., Zinsou, F., Hounpke, V. et al. In Vivo Effects of Fagara Leaves on Sheep Infected with Gastrointestinal Nematodes. Tropical Animal Health and Production 37, 205–214 (2005). https://doi.org/10.1023/B:TROP.0000049295.16925.3d
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DOI: https://doi.org/10.1023/B:TROP.0000049295.16925.3d