Market forces are rapidly driving big changes in housing systems for pregnant sows. Pork producers are wondering how to successfully transition from gestation stalls to penned gestation systems within the confines of existing buildings. This general question was posed by a 5,000-sow, commercial, farrow-to-wean pig producer in North Dakota. Specifically, the producer asked how to retrofit their gestation barn from stalls to pens without changing sow inventory, and what the consequences of such a change would be. While there are many issues that could be studied related to this transition, University of Minnesota researchers chose pen size as the primary issue to consider....
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