According to a scientific review, there’s no scientific evidence that stalls or well-managed pens cause consistent or significant stress among pregnant gilts or sows by measures of physiology, including behavior, performance and health. The review is published in The Professional Animal Scientist, a refereed journal from the American Registry of Professional Animal Scientists. 

The study’s objectives were to review and summarize the scientific literature about measuring behavior, performance or physiology to determine whether the welfare of gilts and sows housed in indoor group pens is different from those housed in stalls. 

The literature review, titled “Compilation of the Scientific Literature Comparing Housing Systems for Gestating Sows and Gilts Using Measures of Physiology, Behavior, Performance and Health,” was done by a multidisciplinary panel of scientists, both national and international. 

National Pork Board