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Online Journal of Veterinary Research ©
Field evaluation of anthelmintics against sheep nematodes in central Ethiopia
Tadesse Eguale1 Hassen Chaka2, Daniel Gizaw2 and Demeke Sibhatu2
1Aklilu
Lemma Institute of Pathobiology, Addis Ababa University P. O. Box 1176, Addis
Ababa, Ethiopia and 2National
Animal Health Diagnostic and Investigation Center, Ministry of Agriculture and
Rural Development, P. O. Box 04, Sebeta, Ethiopia
ABSTRACT
Eguale T, Chaka H, Gizaw D, Sibhatu D, Field evaluation of anthelmintics
against sheep nematodes in central Ethiopia, Online J Vet Res., 14
(2): 270-276, 2010. Albendazole, tetraclozan and tetramisole were
evaluated against nematode parasites in sheep owned by smallholders in two
selected districts of central Ethiopia. Animals were allocated to treatment and control
groups balanced for fecal egg count (FEC), and fecal egg count reduction tests
(FECRT) were performed. There was a 99-100%
reduction in the FEC with albendazole and tetraclozan and 93.1% with tetramisole (in one locality). The efficacy of tetramisole and tetraclozan
varied between localities but there was no significant difference (p>0.001)
in mean fecal egg count. No eggs were found 10 days post-treatment in albendazole treated groups, but some were found in tetraclozan and tetramisole
treated sheep. The results suggest that most of the
nematode parasites in the study areas are susceptible to anthelmintics
and there may be some localized resistance to tetramisole.
Continuous monitoring and field efficacy trial, is required to slow the rate of
selection for helminth resistance.
Key
words: - Anthelmintics; Efficacy; Nematodes; Sheep; Resistance.
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