The use of Immobilon.
D000698:Analgesia / Q000662:veterinary*; D000700:Analgesics / Q000009:adverse effects*; D000818:Animals; D002369:Castration / Q000662:veterinary; D006736:Horses; D008297:Male; D009019:Morphinans / Q000009:adverse effects*; D013035:Spasm / Q000139:chemically induced
D000700:Analgesics; D009019:Morphinans