| Popis: |
The effects of short-term restraint stress, by means of snaring, on plasma concentrations of catecholamines, beta-endorphin, and cortisol were studied in 6 gilts. A catheter was inserted into the jugular vein, and 2 blood samples were collected before onset of stress. Thereafter, a hog snare was applied, and blood samples were collected at 0.5, 2, and 3.5 minutes after the start of snaring. Plasma epinephrine and norepinephrine concentrations increased (P0.001) within 0.5 minute after start of restraint and decreased thereafter. Plasma concentration of beta-endorphin increased (P0.05) within 2 minutes after start of restraint, whereas that of cortisol increased (P0.05) 3.5 minutes after start of restraint. Taken together, short-term stress, such as snaring may increase the plasma concentration of catecholamines, beta-endorphin, and cortisol in pigs. |
