Comparison of analgesic efficacy and fetal effects between transdermal administration of fentanyl and intramuscular administration of buprenorphine in pregnant sheep.

Objective: To compare analgesic efficacy and fetal effects between transdermal administration of fentanyl and IM administration of buprenorphine in pregnant sheep.

Animals: 12 healthy pregnant ewes.

Procedures: Before study initiation, each ewe was confirmed pregnant with a single fetus between 113 and 117 days of gestation.