A study was carried out to estimate the prevalence of major intestinal protozoan parasites of dairy cattle in Bishoftu town, Ethiopia. A total of 334 fecal samples were collected from private dairy farms, Ethiopia meat and dairy industry development institution (EMDIDI) farm, Ethiopian institute of agricultural research farm (EIAR), Bishoftu and from Addis Ababa University (AAU) business enterprise farm. The samples were examined using faecal flotation, modified Ziehl-Neelsen and formalin ether concentration techniques. From the samples, 218 (65.3%) animals were found to be positive to one of the three intestinal protozoan parasites namely Eimeria (53.8%), Cryptosporidium (21.9%) and Giardia (10.2%) which were identified during the study. There was significant difference (p < 0.05) in the prevalence of Eimeria and Cryptosporidium parasites between the age group of the study animals.Similarly, there was a significant difference in the prevalence of the parasites between the fecal consistencies with high prevalence in animals with loose faeces. However, no significant difference was observed in Giardia infections among the age categories, sex and fecal consistency. This study indicates that intestinal protozoan parasites belonging to the three genera are very common and important in Bishoftu dairy farms so due attentionshould be given towards the control and prevention of these parasites.

Keywords: Diclovos, Fertility, Melatonin, Semen,