Colostrum can be the difference between life and death for a piglet. As litter size increases, colostrum intake becomes even more critical, says Bryn Anderson, a veterinary student at the University of Minnesota College of Veterinary Medicine.
“Passive transfer of immunity is one of the most critical determinants of piglet survival and early growth, yet it remains highly variable in commercial systems,” she explained at the Allen D. Leman Swine Conference. “Piglets rely entirely on colostrum for immunoglobulins, but successful intake depends on factors like sow physiology, litter size and piglet vigor.”
She says this variability means that a proportion of piglets consistently fall short of adequate immune protection.
“There has been growing interest in whether management interventions—such as administering oxytocin—could stimulate more efficient colostrum release in the immediate postpartum period,” Anderson says.
She set out to evaluate whether giving a higher dose of oxytocin would improve both colostrum quality and piglet immunoglobulin transfer, since even modest improvements could have meaningful impacts to any size of pork production.
Does Oxytocin Help?
In a systematic, controlled field trial at a commercial sow farm, Anderson enrolled 96 sows in her study and randomly assigned them to either receive a high dose of oxytocin 12–20 hours after farrowing or serve as untreated controls.
For each sow, colostrum samples were collected at approximately one hour and approximately four hours post-oxytocin treatment to measure quality using a Brix refractometer. From each litter, piglets were blood sampled at approximately four hours post-oxytocin treatment, and serum Brix values were recorded to assess adequacy of passive transfer. Piglets were weighed at birth and again at 24 hours to monitor growth. Colostrum intake was estimated using established intake equations based on weight gain, time after birth, and sow colostrum production dynamics.
“This design allowed us to capture both the sow-side effect (colostrum quality) and the piglet-side outcome (serum Ig levels and intake), while controlling for natural variability in parity, litter size and birthweights,” she explains.
Even with a relatively small sample size, she discovered that piglets from oxytocin-treated sows had significantly higher average serum Brix values and a significantly greater proportion reached the passive transfer adequacy threshold compared to controls.
“This shows that oxytocin can meaningfully improve early passive transfer, which is a critical determinant of piglet health and survival,” Anderson says. “The fact that significance was detected with only 96 sows underscores the strength of the effect.”
She says this highlights a potential management tool to increase the proportion of piglets achieving adequate immunity within the critical first hours of life.
“Because commercial systems handle thousands of piglets, even modest improvements in passive transfer rates can add up to substantial performance and economic gains,” Anderson adds. “The study also demonstrates that oxytocin can deliver a measurable benefit even under real-world variability, which is encouraging for practical on-farm application.”
Anderson was one of seven finalists for the Morrison Swine Innovator Prize recognized during the Allen D. Leman Swine Conference. She presented her research findings during a session at the conference.
Researchers in this study include Anderson, Josh Ellingson and Alvaro Franco, both of AMVC Management Services in Audubon, Iowa.
