الفهرس 
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Abstract
A total of 480 broilers chickens were collected from live or recently dead broilers, representing different geographical localities in Dakahlia Province (Belkas, Dekernis, Sherbien and El-Sembilawin). The incidence of Eimeria was (45%). The prevalence of intestinal coccidiosis was (21.3%) and cecal coccidiosis was (49.1%) while, mixed infection (intestinal and cecal caccidiosis) was (29.6%) of infected birds.
According to age of chicken, the incidence were (25.6%), (65.6%) and (43.7%) for 1-14 days, 15-28 days and 29-42 days, respectively.
Regarding to the seasonal dynamics, the results showed that the highest incidence was in winter season (72.5%) followed by autumn season (50%) then spring season (38.3%) but the lowest incidence was in summer season (19.2%).
Evaluation of some common anticoccidial drugs in Egyptian farms specially, in Dakahlia Province was applied through economical parameters included (body weight, body gains, feed conversion ratio and mortality rate), parasitological parameters included (oocyst out put, lesion scoring and sporulation percentages) and histopathological changes that were detected along 6 weeks of rearing.
The anticoccidial drugs that were used in the first experiment included diclazuril, salinomycin were applied as feed supplementation (prophylactic measures) and toltrazuril, amprolium were applied in drinking water post infection (curative measures).
The 1st experiment showed that chickens supplied with diclazuril in feed then infected with E. tenella (Behera Province) had body weights, weight gains, FCR, mortality rate, lesion scoring, and reduction percent of oocysts output better than that of salinomycin supplied group.
Chickens infected with E. tenella (Behera Province) then treated with amprolium in drinking water showed body weights, body gains, FCR, and reduction percent of oocysts output better than that of toltrazuril treated group.
Evaluation of the results at 6 weeks of age of the 2nd experiment showed that body weights, weight gains, FCR, lesion scoring, reduction of oocyst output and reduction of oocyst sporulation % of chicken treated with diclazuril were better than that of amprolium treated chickens either infected with E. tenella (Behera Province) or E. tenella (Dakahlia Province).