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Effect of induction dose, lactation stage and body condition on tiletamine-zolazepam anaesthesia in adult female grey seals (Halichoerus grypus) under field conditions
  1. S. D. Langton, BVetMed, CertVA, MRCVS1,
  2. S. E. Moss, BSc2,
  3. P. P. Pomeroy, BSc, PhD2 and
  4. K. E. Borer, BVSc, DVA, DipECVAA, MRCVS1
  1. Royal Veterinary College, Hawkshead Lane, North Mymms, Hertfordshire AL9 7TA
  2. Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, Fife KY16 8LB
  1. E-mail for correspondence s.langton{at}
  • Mr Langton is also at School of Veterinary Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Bearsden Road, Glasgow G61 1QH

Tiletamine-zolazepam (TZ) was used at a mean (sd) dose of 1.18 (0.15) mg/kg administered intramuscularly to anaesthetise adult female grey seals (Halichoerus grypus) under field conditions at three different stages during their lactation period. A significant correlation was observed between the induction dose and time to induction (r=–0.582, P=0.011). Stage of lactation had a significant effect on condition index (CI), calculated as axial girth divided by length (P<0.001), and time to induction (P=0.009). No effect of CI on induction or recovery time was demonstrated. Respiratory rate decreased during induction and increased significantly (P<0.001) during surgical biopsy of blubber. Recovery occurred after 32.5 (11.9) minutes. Minor complications (tremor, vocalisation and mild dyspnoea) were observed in a small number of cases, none of which required treatment.

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  • Provenance not commissioned; externally peer reviewed

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