Dr. Biruk Tesfaye, Dr. Tesfaye SisayYaekob, Belay2020-06-182023-11-302020-06-182023-11-302014-06http://etd.aau.edu.et/handle/123456789/21783The proportion of major entheropathogens in diarrheic calves was investigated in 26 small, medium and large scale dairy farms of Assela during six months. A total of 108 fecal and sera samples were collected from diarrheic calves up to 4 months of age. Of these, the proportions of E. coli, Eimeria, Cryptosporidium and Giardia detected were 55(50.9%), 42(38.9%), 23(21.3%) and 8(7.4%), respectively. Salmonella Typhimurium was also detected in 3(2.8%) of the sera samples. The most abundant biotype was biotype V, at the rate of 9(56.2%), which fermented the sugars dulcitol, inositol and rhamnose which is possibly ETEC. Biotype VIII, at the rate of 4(3.7%), which fermented dulcitol, rhamnose and xylose might be EPEC. The result of individual and concurrent enteropathogen infections with associated risk factors showed differences in the rate of occurrences of diarrhoea. Considering the complexity of etiologies in calf diarrhoea, further studies are needed to design proper control and preventive measures relevant to the country.enBiotypeCalf diarrheaCryptosporidiumE. coliThesis