Changes which are constantly brought by the transformation of our agriculture, as well as the effort to be involved in the EU market economy and change priorities in various areas of our economy. They can be summarized in the quality, productive health and economy. Blood count does not only change in pigs with age, but it also depends on the method of pig housing, feed and thermal regime. Changes in the haematological status of the organism eventually affects the quality of meat. This study focuses on the hematological status of selected pig breeds including Yorkshire, which is reared in conventional farming and Mangalitsa, which is reared as ecologicallive stock, including more specific characteristics of the studied breeds. The values observed between breeds differ in higher numbers regarding white blood cells and platelets which were found in the Yorkshire breed. In relation to the seasons, we found a gradual increase in values from spring to autumn. Observed differences in the haematological profile can be used in the assessment of animal health in relation to physiological changes in the internal environment during the various stages of life concerning livestock breeding.