The Bo is an early building that can become increasingly more useful as the game goes on. Allowing the player to keep consistent herds of livestock helps delay the use of farms, which is a more slower income of food.

A bo was a type of shack used in Saxony and Germany for cattle, in which the farmer could also spend the night in. They were usually made of very cheap materials like straw. The herdsman was usually employed, and would keep the income made from the dairy cow, and eggs from the chickens.