Pelvic Organ Prolapse project


Sow mortality, specifically as the result of pelvic organ prolapses, has significantly increased in recent years in the U.S. swine industry. This recent increase in prolapses has been reported across different regions, frustrating producers and veterinarians alike primarily due to lack of mitigation strategies, or even the ability to execute mitigation-based research projects. In 2018, the Iowa Pork Industry Center received funding from National Pork Board to lead an industry-wide effort in identifying specific areas that may be contributing to the increasing incidence of prolapses. 

The full final report from the initial Pelvic Organ Prolapse study is now available for download! 

Take-home points:  

• An industry-wide survey was conducted with 104 sow farms representing approximately 400,000 sows and nearly half of the US swine industry, including large integrated companies and many independently owned sow farms.

 • Multiple factors that may contribute to POP in sows were identified, enabling the design of subsequent studies in specific areas of interest. 

• Many areas of presumed potential influence on pelvic organ prolapse have been shown to be minimally influential if at all. 

• A perineal scoring system was developed that is reproducible and indicative of risk of prolapse for individual sows. 

Final report- POP project (pdf)



Video #4: Perineal score and Pelvic Organ Prolapse

Video #3: Water and Pelvic Organ Prolapse

Video #2: Body condition and Pelvic Organ Prolapse

Video #1: Pelvic Organ Prolapse project - Overview 


Pelvic Organ Prolapse Training Video

In order to determine rates of pelvic organ prolapse and  develop solutions, pelvic organ prolapses need to be properly identified and recorded on-farm. This video will help pig caretakers identify and document prolapses. If you would like access to this video and accompanying fact sheet, please fill out this form. 


Check out this webinar about the Pelvic Organ Prolapse project given by Dr. Jason Ross for the National Pork Board Animal Science Research Webinar Series, August 2018. 

Fact sheets

See all fact sheets from the Pelvic Organ Prolapse project on the "Fact Sheets" page.


400K sows provide lessons in POP

National Hog Farmer - October 15, 2018

By Amanda Chipman, Chris Rademacher, Daniel Linhares, Gustavo Silva, and Jason W. Ross, Iowa State University Iowa Pork Industry Center.

More information

Visit the Iowa Pork Industry Center's website for more information on the Pelvic Organ Prolapse Project. Contact Amanda Chipman at with questions about the project.