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Experimental Induction of Drug-resistant Strains of Eimeria tenella against Decoquinate

PAN Hong, LIN Rui-qing, SHU Li, CHENG Tian, LIU Guo-chang, WANG Xin-qiu, WENG Ya-biao   

  1. College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642,China
  • Received:2012-01-30 Online:2012-09-20 Published:2012-09-18

Abstract: The resistance of Eimeria tenella against the anticoccidial drug decoquinate was induced experimentally. The initial concentration of decoquinate was 5.4 mg/kg, E. tenella was serially passaged in chickens with gradually increasing concentration of decoquinate, and it took 9 passages to produce the drug-resistant strain of E. tenella to 54 mg/kg decoquinate. The drug resistance was assessed by RLS (reduction of lesion scores), POAA (percentage optimum anticoccidial activity) and ACI (anticoccidial index). These results of this study would provide foundation and materials for further molecular biological studies of the mechanism of drug resistance.

Key words: Eimeria tenella; decoquinate; drug-resistance; chicken

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