Dairy production is an important component of livestock farming in Ethiopia. Nevertheless, the productivity of the sector has been impacted negatively by the morbidity and mortality of replacement animals. A Cross-sectional study was, therefore, aimed at estimating the prevalence of Nematode and Eimeria infection in calves in Hawassa, Shashemene and Arsi Negelle, southern Ethiopia. To this end, a flotation technique was used to recover Nematode egg and Eimeria oocyst from rectally collected

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... es. The overall prevalence of gastrointestinal parasitic infection, Nematode and Eimeria species collectively, was 43.9% (95% CI=38.6-49.4). The estimated proportion of Nematode, Eimeria and mixed infection was 35.8%, 21.5% and 13.3%, respectively. Among the potential factors considered faecal consistency, age and study area were found to increase recovery of Nematode egg and Eimeria oocyst in faeces (p< 0.05). Area wise, the prevalence has been noted to be higher at Arsi Negelle followed by Hawassa and Shashemene (p< 0.05). Besides, younger and diarrheic calves were found more infected by Nematode and Eimeria species than their adult and non-diarrheic counterpart. Based on their morphological appearance, Strongyle type (20.3%), Trichuris (4.2%) and Ascaris (16.3%) eggs, Eimeria oocysts (21.5%) were observed. In the light of this finding, the authors would like to advise the need for strategic intervention.