Swine Castration: The AVMA recommends the use of procedures and practices that reduce or eliminate pain, including the use of approved or AMDUCA-permissible clinically effective medications whenever possible. The AVMA encourages development and implementation of practical analgesic and anesthetic protocols for, and alternatives to, swine castration.
Tail Docking and Teeth Clipping of Swine: The AVMA recommends the use of procedures and practices that reduce or eliminate pain, including the use of approved or AMDUCA-permissible clinically effective medications whenever possible.
http://www.aasv.org/news/story.php?id=4243