EN
Three cases of perforating abomasum ulcerations, confirmed post-mortem, were described in HF dairy cows. The animals came from the free-standing maintenance system farms of high productivity. The diagnosis was based on specific clinical, laboratory and post-mortem tests. Chosen hematological parameters, the activity of liver enzymes, bilirubin, total protein and urea concentration as well as the level of Ca, Mg, Pi, K and Na macroelements, were evaluated in the blood of the examined animals. The changes noted in hematological and biochemical blood indexes do not explicitly determine the intensity of pathological (disease) processes within the wall of the abomasums. On the basis of the received results, the conclusion was drawn that an intravital reliable diagnosis (clinical and laboratory) of abomasums ulceration is not possible, especially at the initial stage of the disease, and most cases are identified post-mortem or posts slaughter.