A Pen is Most swine are grouped together in Pens, whether kept in a shelter or in a fenced oPen lot. The number of animals Penned together may be less than 10 to several hundred, but is normally between 15 and 30.

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Other /More definition:
A Pen is Most swine are grouped together in Pens, whether kept in a shelter or in a fenced oPen lot. The number of animals Penned together may be less than 10 to several hundred, but is normally between 15 and 30.