Pigs turn ordinary plant foods into Manure, while a separate Monster Meat route converts a pig into a meat and Pig Skin target.
PC / Global, base game with Reign of Giants-compatible notes where stated
WHERE & HOW TO FARM
Where to farm
Pig Houses and Pig Villages in the overworld; use a separated fight area if deliberately making a Werepig.
Choose the pig output you need before feeding. For Manure, give a pig fruit, vegetables, or petals; it produces a manure pile, making a pig house near a garden a useful renewable fertilizer source. For meat and Pig Skin, feed Monster Meat until the pig transforms into a Werepig, then fight it away from the house and collect its drops. Four pieces of Monster Meat trigger the transformation according to the wiki, and a Werepig drops two Meat and one Pig Skin. These are different loops with different risks: regular pigs are a non-combat source of manure, while Werepigs are hostile. Do not leave monster food around a pig village where pigs could eat it unintentionally. The route supplies farm input or creature loot; it does not require rabbit traps or Spider Dens.