This four-level structure houses pigs, cows, chickens, and sheep. Each floor has a chest with breeding-appropriate food for each corresponding animal.
The original animal farms were located almost on the exact opposite side of the mountain shown in the picture. They were accessible by using a backdoor in the old Community Center that was hollowed into this mountain. The original design had all the pens aligned horizontally, which took up a considerable amount of lateral space.
The new, vertically-designed building was added in October 2012.
Before Minecraft 1.3.1, pigs used to drop an anemic 0-2 porkchops, making them an inefficient animal. They were almost left out of this farm design as a result. They now drop 1-3 porkchops, guaranteeing some return on the time it takes to cull them.