With a centralisation of pig abattoirs owned by large multinationals, many small-scale pig farmers say they have limited choices on where to send their pigs for slaughter.
The pork industry says stunning pigs with carbon dioxide gas before slaughter is "science-backed" and legal, after footage of the practice shot by animal rights activists was aired by the ABC's 7.30 program.
The use of carbon dioxide to stun pigs before slaughter is legal and widespread – but activists believe the industry doesn't want you to know what it looks like.