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![Livestock pens in Chicago 1947](http://upload.wikimedia.org/wikipedia/commons/thumb/7/71/Livestock_chicago_1947.jpg/425px-Livestock_chicago_1947.jpg)
Livestock comprises domesticated animals, that may be kept or raised in pens, houses, pastures, or on farms as part of an agricultural or farming operation, whether for commerce or private use. The picture shows the maze of livestock pens and walkways at Chicago's stockyards, ca. 1947.