Comparison of extradural injections of lignocaine and xylazine inazaperone-sedated pigs

摘要

Most surgical procedures performed on pigs under field conditions are at sites caudal to the diaphragm (Runnels, 1976) for which regional anaesthesia is effective and there have been a number of reports on the use of an extradural block in pigs (Getty, 1966; Strade, 1968; Trim, 1980; Elmore, 1981; Framstad & Knaevelsrud, 1992; Ko et al., 1992). Lignocaine is used for providing a veterinary epidural block (Hall & Clarke, 1991) and, more recently, an extradural block with xylazine has also been reported in pigs (Ko et al., 1992). However, the relative efficacy and safety of both drugs for porcine extradural blocks are yet to be reported. The objectives of the present study were to compare the onset and duration of analgesia, duration of recumbency and changes in heart rate, respiratory rate and rectal temperature in azaperone-sedated pigs to which lignocaine and xylazine had been administered extradurally.