They can cause dehydration very often at the origin of the death of the animal in 6 to 12 hours (Rovary and Sattler, 2006). A quick intervention of the veterinarian is vital for the survival of the animal. The risk of diarrhea is highest during the first week after calving (4th-10th day) (Lorenz, 2007). The incidence of diarrhea in calves of less than 30 days varies from 15 to 20% and the risk of mortality is 1.5 to 8% (Koch and Kaske, 2008). The etiologic agents are numerous and differ depending on the age of the animal (Castro
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