Abstract
Venous blood was collected from porcine stress syndrome (PSS)-susceptible ( n=23) and -resistant ( n=55) 3-month-old Landrace pigs. Susceptibility to PSS was determined by the halothane test and resistance was confirmed by the halothane succinylcholine test, which were performed after the blood sampling procedure. Plasma levels of norepinephrine and epinephrine (pg ml −1) were determined by high performance liquid chromatography (HPLC) with electrochemical detection. Norepinephrine levels ( X± SEM ) were significantly higher in the PSS-susceptible pigs (993±109) than in their PSS-resistant (573±41) counterparts. The levels of epinephrine on the other hand, were the same in both groups, 168±14 for the PSS-resistant group and 186±31 for the PSS-susceptible group. It was concluded that PSS-susceptible animals experience a significantly higher noradrenergic sympathetic response to handling stress associated with routine blood collection.
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