[Neonatal thrombocytopenic purpura in a black and white male calf. Case report].

A report is given on a newborn calf showing mucosal hemorrhage and melena. All blood clotting tests, except for prothrombin time (which proved to be initially prolonged), had normal results. The striking recurrent thrombocytopenia was successfully treated with prednisolone. Autoimmune idiopathic thrombocytopenia is suspected as a possible cause.