Antinematicidal activity of Nicotiana tabacum L. leaf extracts to control benzimidazole-resistant Haemonchus conortus in sheep
2013
Hamad, K.K. (University of Agriculture, Faisalabad (Pakistan). Dept. of Parasitology) | Iqbal, Z. (University of Agriculture, Faisalabad (Pakistan). Dept. of Parasitology) | Zia-ud-Din, S. (University of Agriculture, Faisalabad (Pakistan). Dept. of Parasitology) | Muhammad, G. (University of Agriculture, Faisalabad (Pakistan). Dept. of Clinical Medicine and Surgery)
This study was carried out to assess the efficacy of Nicotiana (N.) tabacum leaves to control benzimidazole-resistant Haemonchus (H.) contortus in sheep. Fecal egg count reduction test (FECRT) and egg hatch assay (EHA) revealed catastrophic levels of resistance in H. contortus of sheep against oxfendazole, a member of benzimidazole group of antinematicidals. Antinematicidal efficacy of N. tabacum leaves was evaluated employing EHA, adult motility test (AMT) and FECRT. There was a dose and time dependent antinematicidal activity of crude aqueous methanol extract (CAME) of N. tabacum leaves with estimated LC50 values of 0.566 and 1.91 mg ml-1 in EHA and AMT, respectively. There was, however, no significant difference (P greater than 0.05) in fecal egg count reduction (87.5 vs 88.6%) in sheep at low (2 g per kg BW) and high (4 g per kg BW) doses of CAME of N. tabacum leaves. Administration of N. tabacum leaves at low dose (2 g kg-1 BW) did not exhibit untoward effects in animals; therefore, may be used in sheep harboring antinematicidal-resistant populations of H. contortus.
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