Welcome to Warcraft 3 Extended Edition, a project with the goal of expanding the existing game by adding unused features from the campagin as well as by adding new content of the highest possible quality while trying to keep the game as balanced as it can be.
One of the additions Orcs have got is the Pig Farm, the building the Orcs from the campagin have in many occasions.
To obtain them, the player has to upgrade to Stronghold and then upgrade Orc Burrows into them. At the cost of defense, the player gets 5 bonus food per Pig Farm and can also raise Pigs, which can be used as scouts just like the Human Mechanical Critters.