Administration of ground-up tick tissue stabilate (0.75 tick equivalent) by the subcutaneous route to crossbred calves aged 1 week to 1 month led to the development of acute theileriosis. Haematological studies revealed significant progressive decreases in haemoglobin concentration, packed cell volume and red blood cell count, whereas the total leukocyte count showed an initial non-significant leukocytosis followed by a significant leukopenia. Analysis of serum revealed significant increases in levels of alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, creatinine kinase and gamma-glutamyltransferase, and in the concentrations of uric acid, blood urea nitrogen and bilirubin. The concentrations of total protein, albumin, glucose, cholesterol and calcium showed non-significant decreases, while phosphorus decreased significantly during the terminal stages of the disease.

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