Full Breakdown
Study Highlights Factors Influencing Pelvic Organ Prolapse in Sows
3/28/2026, 12:09:47 PM
Overview of the Study
A recent study led by Tricia Haefner at Iowa State University has shed light on the factors contributing to pelvic organ prolapse (POP) in crossbred sows, a significant issue affecting U.S. pig farmers. The research, conducted during the summer of 2023, involved data collection from 3,983 crossbred sows on two commercial farms in the Midwest. The study aimed to evaluate both genetic and non-genetic factors associated with the susceptibility to vaginal and uterine prolapse.
Key Findings on Body Condition and Perineal Scoring
The study confirmed a strong correlation between body condition score (BCS) during late gestation and the incidence of POP. Jenelle Dunkelberger, a geneticist at Topigs Norsvin USA, emphasized that sows with lower body condition scores are at a significantly higher risk for prolapse. Dunkelberger noted, “Late gestation is just a snapshot in time, but we should consider what her body condition at this time point might imply about her development prior to that point.”
Additionally, researchers employed a perineal scoring system to assess the perineal region for swelling and redness. This scoring indicated a high genetic correlation with actual POP, suggesting that perineal score could serve as an early indicator of susceptibility to prolapse. Haefner stated, “This helps identify it a little sooner so we can develop mitigation strategies.”
Impact of Housing Conditions
The study also revealed that sows managed under California Proposition 12 regulations, which require group housing, exhibited a higher risk of POP compared to those kept in stalls for the first 35 days post-breeding. Haefner remarked on the unexpected findings, noting that while these sows had higher average body condition scores, they faced increased stress during the critical breeding period. She speculated that competition for feed and social hierarchy might contribute to this increased risk.
Genetic Insights and Future Directions
Haefner's genetic analysis confirmed moderate heritability for both perineal score and POP, validating previous findings regarding genetic susceptibility. Dunkelberger highlighted the necessity of addressing both genetic and non-genetic factors to effectively reduce the incidence of POP. She stated, “Genetics can be part of the solution, and should be part of the solution,” while also stressing the importance of managing body condition as a critical factor.
Criticism and Alternative Perspectives
While the study underscores the importance of genetic selection and management practices, some experts argue that reliance solely on genetic solutions may overlook significant environmental and management factors that also influence sow health. Critics suggest that a more holistic approach, integrating both genetic and management strategies, is essential for meaningful improvements in sow longevity and health.
Verbatim Quotes
- “Sows that are too thin during late gestation are at a substantially higher risk of prolapse,” — Jenelle Dunkelberger, Geneticist at Topigs Norsvin USA
- “This helps identify it a little sooner so we can develop mitigation strategies.” — Tricia Haefner, Iowa State University
- “Genetics can be part of the solution, and should be part of the solution,” — Jenelle Dunkelberger, Geneticist at Topigs Norsvin USA
This study highlights the multifaceted nature of POP in sows, emphasizing the need for continued research and a comprehensive approach to management and genetic selection to enhance sow longevity and reduce mortality rates.
