Behavioral and Antinociceptive Effects of Alfentanil, Butorphanol, and Flunixin in Horses

To determine the behavioral and antinociceptive effects of narcotic and non-narcotic analgesics administered by intravenous injection in horses, 10 thoroughbred mares weighing between450 and550 kgand ranginginagefrom8to13yearsold wereanalyzed. Theeffectsofalfentanil,butorphanol, flunixin,andsalinesolutiononthegeneralactivityof the horseswereinvestigatedbymeasuringspontaneous locomotoractivity(SLA)andhead height (HH) in two behavior stalls. The antinociceptive effects of alfentanil (0.02 mg kg