EN
The studies were performed on 36 broiler chickens in 3 experimental groups, 12 animals of each; group I — control, group II and III — chckens immobilized everyday for 5 h. Moreover in the IIIrd group at the day 15 of the experiment after 2 h immobilization chickens were dipped into a water bath (16°C) for 15 min. with 1 min. breaks after each 5 minutes. In blood obtained by decapitation the following parameters were determined: level of adrenaline, noradrenaline and corticosterone, metabolic activity of neutrophiles. It was found that immobilization induces in chickens a significant increase of blood adrenaline, noradrenaline and corticosterone level. A new type of the stressor used, water bathing, increased further significantly the level of the examined hormones. The used stressors did not affect metabolic activity of neutrophiles.