[Resistance development of field isolated eimeria spp. against some anticoccidial drugs]

ABSTRACT

There is no doubt that coccidiosis is a common and an important disease in the domestic fowl. It has been shown that the disease has brought about great losses in the poultry industry of Iran. Medication current by anticoccidial drug in the chicken has been started about 80 years ago in Iran, in recent years reports of coccidial agents developing resistance to anticoccidial drugs have been increased. The aim of this study was to determine the sensitivity of field isolated Eimeria spp. The effect of amprolium - ethopabate and lasalocid was tested in experimentally infested chicks of 4 weeks of age. The results showed that the amprolium was unable to prevent oocyst shedding. However, lasalocid was efficient in reducing oocyst output to a very significantly low level [P<0.05]. Comparing the anticoccidial effect of sulphaquinoxaline - diaverdine against clinical condition of coccidiosis indicated that it could not inhibit Eimeria acervuling oocyst shedding but toltrazuril was highly effective against combined infection with E. acervulina, E. tenella E. maxima and E. necatrix