The pig farm was the subject of a TVNZ Sunday item, in which animal welfare activists took King, who had fronted promotions for the New Zealand pork industry, to the site to highlight the pigs' allegedly poor treatment.
Ministry of Agriculture and Forestry investigators, who visited soon after, said the piggery was not breaking any animal welfare laws.
Sow crates, also called sow stalls, were banned in 2015.
In announcing the phasing out and eventual ban of the cage-like stalls, then-Agriculture Minister David Carter said in 2010: "The growing unease of many New Zealanders about the use of sow stalls, which I share, made it clear that change was necessary. The science also supports this."