Anthelmintic activity of Lippia sidoides essential oil on sheep gastrointestinal nematodes
2008
Camurça-Vasconcelos, A.L.F. | Bevilaqua, C.M.L. | Morais, S.M. | Maciel, M.V. | Costa, C.T.C. | Macedo, I.T.F. | Oliveira, L.M.B. | Braga, R.R. | Silva, R.A. | Vieira, L.S. | Navarro, A.M.C.
Medicinal plants have been investigated for their anthelmintic properties and shown to be effective against eggs and larvae of gastrointestinal nematodes. The aim of this study was to evaluate the efficacy of the Lippia sidoides essential oil (LsEO) on sheep gastrointestinal nematodes. Initially, 44 naturally infected sheep were divided and treated with 200μgkg⁻¹ ivermectin and 230 and 283mgkg⁻¹ LsEO, respectively, plus the control. Fecal samples were collected from each animal to determine epg at 7, 14 and 21 days after treatment. In another test, 21 sheep were distributed and treated with 200μgkg⁻¹ ivermectin, 283mgkg⁻¹ LsEO and the control, respectively. Seven days after treatment, they were euthanized and necropsied to count and identify the nematodes from the abomasum, small and large intestines. In the first test, the efficacy of 230 and 283mgkg⁻¹ LsEO and ivermectin was 38%, 45.9% and 40.2%, respectively, 7 days after treatment, and 30%, 54% and 39.6%, respectively, 14 days after treatment. In the second experiment, the respective efficacy of 283mgkg⁻¹ LsEO and ivermectin was 56.9% and 34.4% against Haemonchus spp., and 39.3% and 63.6% against Trichostrongylus spp.
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