eimeria infection in dairy cattle of industrial farms in kangavar suburban of kermanshah province, iran

background: eimeria infection is an important part of protozoal infection in ruminants which causes economic lost in animal husbandry of iran and worldwide. therefore it is important to implement effective control programs on the prevalence and diversity of eimeria species in livestocks. objectives: this study was aimed to determine prevalence and eimeria species diversity in dairy cattle with different age groups under industrial management. methods: the present study was carried out in industrial cattle husbandry of kangavar suburban of kermanshah province, iran, from spring 2011 to 2012. a total of 307 fresh fecal samples were randomly collected from the rectum of examined animals. the fecal specimens were subjected for flotation technique and collect eimeria oocysts. the intensity of infection was determined using mcmater method. eimeria species diversity and frequency was also determined by using oocyst sporulation technique in 2.5% potassium dichromate. results: the overall prevalence was 31.92% (98 out of 307). the highest prevalence was found in dairy cattle (37%) with 1-3 years old. there was no significant difference between prevalence and different age groups. the highest frequency was significantly in spring (41.66%). the intensity was variable in examined animals which ranged from 3.18×103 to 2.71×105. there was no significant difference between the prevalence and intensity in all age groups. fecal consistency findings revealed that the highest infection was significantly in dairy cattle with normal fecal consistency in all age groups. according to laboratory identification, a number of seven eimeria species were detected in all infected animals. the most common specie was e. zuernii (28.25%) in 5% dairy cattle (1-3 years-old) in spring (30%) and summer (30%). there was significant association between frequency of eimeria infection and each season during the course of the study. all infected cattle had mixed infections with two (42.85%) and three (3.15%) species of eimeria. conclusions: the results of this study indicated that cattle eimeria infection was a problem in dairy cattle of industrial farms in the region. attention should be paid within seasonal infection in young cattle to avoid probable clinical coccidiosis, particularly in farms with poor hygienic conditions and no prophylactic treatments.