Beavers (Castor fiber)

Table of doses for beavers

Drug Dose Comments
Gaseous anaesthesia can be used in all species and in most it is the preferred method
Ketamine + diazepam
  • Sedation: Ketamine (12.5 mg/kg) + diazepam (0.2 mg/kg) i.m.
  • Sedation generally occurs within 15-20 minutes after which anaesthesia can be induced using isoflurane delivered in 100% oxygen via a facemask
Ketamine + medetomidine
  • Ketamine (7.5 mg/kg) + medetomidine (0.07 mg/kg) i.m.
  • No problems were associated with this regime
Ketamine + butorphanol + medetomidine
  • Ketamine (5 mg/kg) + butorphanol (0.1 mg/kg) + medetomidine (0.05 mg/kg) i.m.
  • Mean induction time was 8.4 ± 5.0 minutes
Ketamine + butorphanol + medetomidine + midazolam
  • Ketamine (5 mg/kg) + butorphanol (0.1 mg/kg) + medetomidine (0.05 mg/kg) + midazolam (0.25 mg/kg) i.m.
  • Mean induction time was 7.8 ± 2.6 minutes
  • Note that better muscle relaxation was achieved with this regime compared with ketamine + butorphanol + medetomidine
  • 5x dose (mg/kg) medetomidine used
  • Reversal of medetomidine: 5 times the medetomidine dose (i.e. equal volume of the 5 mg/ml atipamezole solution)
  • In common with most species, a delay in reversal of medetomidine of at least 20 minutes after the administration of combinations with ketamine is recommended

Ranheim B, Rosell F, Haga HA and Arnemo JM (2004) Field anaesthetic and surgical techniques for implantation of intraperitoneal radio transmitters in Eurasian beavers (. , 11-15.

Campbell-Palmer R, Rosell F, Naylor A . (2021) Eurasian beaver () health surveillance in Britain: Assessing a disjunctive reintroduced population. , 8.

Campbell-Palmer R and Rosell F (2015) Captive care and welfare considerations for beavers. , 101-109.

Saunders R (2016) Other insectivores and rodents. In: , 2nd edition, ed. E Mullineaux and E Keeble, pp. 152-175 BSAVA Publications, Gloucester



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