الفهرس 
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Abstract
This study was carried out to investigate the effects of phytobiotics, probiotics, chemical anticoccidial toltrazuril and their combinations as preventive medications for coccidiosis in poultry farms and also to examine these effects on growth performance parameters (average body weight, body weight gain, feed consumption and feed conversion ratio) in broiler chickens. Their effects on some blood biochemical parameters, immunity indices and giblets weights in broiler chickens were also determined.
Two hundred and forty, one-day old Cobb chicks were used. They were divided into eight equal groups, 30 birds each. The 1st group was non-infected non-treated group. The other groups were directly inoculated intra-crop with 1x105 sporulated oocysts of field strain of Eimeria spp. on the 8th day of age. The 2nd group was kept as infected and non-treated group. The 3rd group was infected and treated with phytobiotic (300 mg/Liter drinking water). The 4th group was infected and probiotic treated at a dose of 1 gm/ liter drinking water. The 5th group was infected and treated with toltrazuril 2.5 % (7 mg/kg BW in drinking water). The 6th group infected and treated with phytobiotic plus probiotic. The 7th group infected and treated with phytobiotic plus toltrazuril 2.5 %, while the 8th group was infected and treated with probiotic plus toltrazuril 2.5 %.
Phytobiotics treated groups and probitic treated groups at the 3rd and 5th week of age showed a significant decrease of lesion scores and oocyst output of coccidial infected chickens.
Phytobiotics and probiotic treated groups showed significant increase of body weight, body weight gain and feed consumption. While these groups showed a significant decrease of feed conversion ratio (FCR). On the other hand, toltrazuril treated chickens showed no effect on body weight, body weight gain and feed consumption. But this group showed a significant increase of FCR.