Seasonal Variation in Succinylcholine Immobilization of Captive White-Tailed Deer

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Abstract
Succinylcholine chloride administered i.m. by Cap-Chur projectile syringe induced immobilization in 122 (91.7%) of 133 different injections to a total of 15 female and 10 male captive white-tailed deer (Odocoileus virginianus) ranging in body weight from 22.3-99.1 kg and in age from 0.4-3.5 yr. Seasonal variation in the effective immobilizing dosage rate over the annual cycle of body condition was significant (P < 0.005), increasing 60.8% from the low in Feb.-March of approximately 0.153 .+-. 0.006 mg/kg0.75 to the high in the fall months of Sept.-Nov. of 0.246 .+-. 0.003 mg/kg0.75. Mean latency for all immobilizations was 4.59 .+-. 0.16 min with recovery occurring in a mean interval of 17.90 .+-. 0.56 min. No drug-induced mortality occurred over the 16 mo. period.