EN
In 15 pigs subjected to the stress of isolation, immobilization and slaughter, the c-reactive protein, ceruloplasmine, total protein level, gamma-globulin fractions, as well as lysozyme activity in the sera were tested. It was determined that the stres connected with slaughter does not effect changes in the concentration of acute phase protein (APP), while total protein levels as well as gamma globulin fractions are lowered both during immobilization and stress. Lysozyme activity in the sera rises during the isolation of the pigs, which may indicate the mobilization of uncharacteristic defence mechanisms.