| Summary |
Eight strains of coccidiae were isolated from the fields with coccidiosis. Six strains of them were Eimeria tenella, and 2 other strains were unknown species. Six anticoccidial drugs, including amprolium (120 ppm), lasalocid (75 ppm), maduramicin (5 ppm), nicarbazin (125 ppm), salinomycin (60 ppm) and Esb3 (150 ppm) were tested for their efficacy in preventing coccidiosis in SPF chickens infected with 3 strains of E. tenella. The results indicate that one strain is resistant to all the drugs tested and another 2 strains is sensitive variably only to nicarbazin, amprolium and Esb3. In conclusion, some of the field isolates of coccidia in Taiwan are resistant to anticocidial drugs.
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