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¹ Box 100126 HSC, Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, Florida 32610-0126, USA;
² The Lubee Bat Conservancy, Lacrosse, Florida 32609, USA
³ Corresponding author (email: HeardD{at}mail.vetmed.ufl.edu)

ABSTRACT:   Four medetomidine/ketamine (M/K) doses (30 µg/kg/3 mg/kg; 40/4; 50/5; 60/6), administered by intramuscular injection, were evaluated for short-term immobilization of adult male variable flying foxes (Pteropus hypomelanus). The highest dose (60 µg/kg/6 mg/kg) produced a significantly faster induction (31 ± 46 sec) than the lowest dose (30/3) (125 ± 62 sec). The highest dose levels (50/5, 60/6) produced significantly longer immobilization times (52.5 ± 25.7 min and 60.6 ± 20.8 min, respectively) than did the lower doses (30/3, 40/4) (18.8 ± 8.7 min and 31.0 ± 14.3 min, respectively). The dose at which 50% of the bats were immobilized for 30 min (ED₅₀) was approximately 40 µg/kg/4 mg/kg. This dose produced a mean immobilization time of 31 ± 14 min, bradypnea and bradycardia. In conclusion, a M/K dose of 50 ug/kg/5 mg/kg is recommended for greater than 30 min of relaxed immobilization in free-living variable flying foxes and is sufficient for safe collection of samples.
  Key words:  Anesthesia, bat, flying fox, ketamine, medetomidine, Pteropus hypomelanus.

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