title: Comparative evaluation of the analgesic effects of epidural morphine, alfentanil, butorphanol, tramadol and U50488H in horses.
authors.affiliation: University of Minnesota, St Paul, MN, USA.
authors.forename: C C
authors.initials: CC
authors.lastname: Natalini
authors.affiliation: University of Minnesota, St Paul, MN, USA.
authors.forename: E P
authors.initials: EP
authors.lastname: Robinson