“Livestock fatten faster when tasked on a Pen. Trains Sheep.”
The Livestock Pen is an economic building in Age of Empires III. It trains livestock which can be tasked to the Livestock Pen to make them fatten at a faster rate.
Native American civilizations have Farm instead of Livestock Pen which combines the functions of a Mill and a Livestock Pen, while the Chinese have Village instead of Livestock Pen which combines the functions of a House and a Livestock Pen.
The Indians have Sacred Field instead of Livestock Pen that increases the experience generation rate of their livestock, which cannot be gathered from by their Villagers, while the Japanese lack a building that fill the Livestock Pen's function since their Villagers cannot gather food from animals.
“Keeping animals was important to the founding of the New World, especially as areas became settled and hunting became less abundant. Animals were used for food, but they had other uses as well. Fat from animals was used to make soap, the skins were used for clothing, and tallow was used in candles. Tallow was also used to keep leather supple and water-resistant.”