Abstract
Epidural xylazine injected at the sacrococcygeal site 40 to 150 min prior to surgery (at a dose of 0.05 to 0.10 mg/kg) provided good analgesia during scrotal skin incision in all 20 experimental rams but in only 10 rams (50%) at incision and separation of tunica vaginalis, and 6 rams (30%) during ligation of the spermatic cord. There was a significant correlation between the decrease in heart rate and the dosage of epidural xylazine. Heart rate increased significantly during incision of the tunics and spermatic cord ligation but was not significantly correlated to the clinical assessment of analgesia. There was no significant correlation between the presence of surgical analgesia and the dosage of epidural xylazine: Pelvic limb ataxia was still evident in 12 rams (60%) at 8 h after epidural xylazine injection. Epidural xylazine provided good somatic analgesia during open castration of 20 rams but visceral analgesia was unpredictable. Factors in addition to the dosage of sacrococcygeal epidural xylazine affects the degree of surgical analgesia obtained for open castration of rams.
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