Diriba Lemma, Birhanu Abera and Eyob Eticha
The study aimed at assessing parasite control practices in use and to determine existence of gastro intestinal nematodes resistance for Albendazole, Tetraclozash and Ivermectin, in naturally infected sheep under field conditions. In Lemu Bilbilo district, sheep of both sexes randomly select from small holder farmers from different Pa’s were used for the study. Before the actual experiment, screening was done to identify sheep naturally infected with Gastro intestinal nematodes and Eggs per Gram (EPG) greater than 200 were eligible for inclusion in the field experiment following guidelines by Coles, et al. Accordingly a total of 48 animals grouped into four treatment groups Albendazole, Tetraclozash, Ivermectin and control (left untreated). Albendazole, Tetramisole and Ivermectin were found 90.53%, 98.1% and 96.59% respectively.
The percentage reduction of faecal egg count (95% confidence intervals) for Albendazole, Tetraclozash and Ivermectin were, 95.83%, (95.1-84.4) 98.1% (99- 90.99) and 96.59% (97.01-91.3) respectively. Resistance is suspected on albendazole based on the findings, it was concluded that development of anthelmintic resistance could be prevented by avoid frequent and unnecessary treatments anthelmintics, opting instead for strategic deworming.
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