FarmVille pigpens slowly starting to roll out to players

FarmVille pigpens are starting to arrive on farms as you read this. I've already started getting requests from materials from my neighbors on my Facebook wall.

Here's what we've learned about the pigpens so far:

    Like the chicken coops, you can only have one per farm
    Pigpens can be harvested every 24 hours
    When you harvest, you have a 15% chance of acquiring an item
    Pigpen takes 8 Wooden Boards, 8 Nails and 8 Brick to build
    The pigpen holds 20 pigs
    The pigpen is 7x6 or 42 squares

Read more: FarmVille Pigpens: Everything You Need to Know