The Animal Welfare (Pig Industry) Regulations 2010 provide for the welfare of commercially-kept pigs. Key regulations include:
• new minimum space requirements for pig enclosures
• six-week limit on the time a sow can be kept in a farrowing crate
• from 2017, a six-week limit on the time a pregnant sow can be confined in a sow stall.
http://www.porkcrc.com.au/101102_New_welfare_regulations_for_WA_pig_industry.pdf