There are several strains of coccidia in cattle, although all are Eimeria. E. zuernii, bovi etc. Some are much worse than others, and can kill. I prefer to keep calves on milk, since they need the nutrition, and add in electrolytes in addition as needed. Treat with either amprolium as directed, sulfas as directed or rumensin (again, too slow for me...) in the sweet feed. My favourite preventative/treatment is deccox, but it isn't fast enough if you're losing calves. Vets are a resource which when used correctly can save you money, not cost it!! Use us! V