Observing "human sniffers" at slaughterhouse in The Netherlands that accepts intact boars
In October, 2009 CETFA, Eyes on Animals, CCFA (Canadian Coalition for Farm Animals), and a number of other animal advocacy organizations around the world, were invited to tour a large slaughterhouse in The Netherlands that accepts intact male pigs.
The Netherlands passed legislation banning the cruel practice of castration of male piglets. The piglets are slaughtered before "boar taint" from sex hormones develops, thus the practice is unnecessary.
For the rare male pig that develops the taint, "human sniffers" are hired to heat the fat above the shoulder of the pig (where the hormone has highest accumulation) and sniff it. Those that have the taint are marked and put into the line for the more highly spiced meats (the same line boars in Canada are put into).
In Canada, all male piglets are routinely castrated - an elective surgery done without anesthetic or analgesics. The open wounds often become infected so sub-therapeutic levels of antibiotics are fed to the pigs.