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Background  A longitudinal prospective study was conducted from October 2017 to April 2018 on calf diarrhea and coccidiosis in dairy farms in Bahir Dar, North West Ethiopia with the objectives of determining the incidence of calf diarrhea and calf coccidiosis from diarrheic calves, assessing the major risk factors associated with calf diarrhea and coccidiosis and identifying the existing  Eimeria  species. A total of 237 calves, 86 calves from 52 smallholder dairy farms and 151 calves from 8 large dairy farms, were used for this study. Fresh fecal samples were collected from 86 diarrheic calves for identification of  Eimeria  species.    Results  Overall incidences of calf diarrhea and coccidiosis found in this study were 33.5 and 20.1%, respectively. In total, 19 potential risk factors were investigated for their association with calf diarrhea and coccidiosis from diarrheic calves using Cox regression. Age of calf (HR = 2.057,  P  = .002), body condition (HR = 1.802,  P  < .001), house condition (HR = 2.072,  P  = .004) and age at first colostrum feeding time (HR = 2.107,  P  = .002) were found significantly ( P  < 0.05) associated with the risk of diarrhea by multivariate Cox regression. Among the risk factors tested, age (HR = 13.36,  P  < .001) and sex of calves (HR = 3.500,  P  = .020) were found significantly ( P  < 0.05) associated with coccidiosis by multivariate Cox regression. A total of nine  Eimeria  species were identified.  E. bovis  (28.6%),  E. zuernii  (19.0%) and  E. auburnensis  (14.3%) were the most common  Eimeria  species encountered.    Conclusion  The incidence of calf diarrhea and coccidiosis was high in the dairy herds in North West Ethiopia. Therefore, sound dairy calf management practices are needed to mitigate risk factors for calf diarrhea and coccidiosis with a view to reducing the incidence of calf diarrhea and coccidiosis in Ethiopian dairy farms.

Epidemiological study on calf diarrhea and coccidiosis in dairy farms in Bahir Dar, North West Ethiopia