Hypoglycemia (glucose <65 mg/dl) was detected in 21 of 28 immobilized free-ranging black rhinoceroses (Diceros bicornis). At repeat sampling 25 min later, only 6 of 28 were hypoglycemic (P<0.05). Lactate was significantly higher (P<0.0001) early in immobilization. Hypoglycemia and elevated lactate may increase risk of anesthetic complications and postrecovery problems.

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