| immobilization of wyoming bears using carfentanil and xylazine. | seven grizzly (ursus arctos; four male, three female) and three black (ursus americanus; two male, one female) bears caught in culvert traps or leg snares were immobilized in northwestern wyoming with carfentanil and xylazine at doses, respectively, of 0.011 ± 0.001 and 0.12 ± 0.01 mg/kg for grizzly bears and 0.014 ± 0.002 and 0.15 ± 0.04 mg/kg for black bears. these drugs were antagonized with 1 mg/kg naltrexone and 2 mg/kg tolazoline. induction and recovery times, respectively, were 4.3 ± 0.5 ... | 2013 | 23778620 |