Purdue sperm-protein vaccine cuts animal fertility 67%
Get the Health newsletter
Daily health & science — research, biotech, public health, the studies worth knowing. Free.
- Purdue University researchers designed a contraceptive vaccine based on the IZUMO1 mammalian sperm protein that induces infertility in female mammals by blocking sperm-oocyte fusion
- The vaccine reduced fertility 59% to 67% overall across experimental groups, with production validated via SDS-PAGE and western blot analysis
- Dr. Harm HogenEsch and Dr. Raluca Ostafe developed the vaccine, targeting overpopulation in feral horses, deer, swine, and other wildlife
- Prior contraceptive vaccines have drawbacks including short-lived effects, injection site reactions, hormone-driven behavioral changes, and supply chain vulnerability — limitations HogenEsch says the Purdue vaccine overcomes
- HogenEsch's team is in year one of a three-year project testing the vaccine on horses, with potential applications for wild horse management
- Future development aims for a single-dose controlled-release formulation deliverable via darts or oral routes, which HogenEsch calls critical because follow-up doses in wildlife are often impossible
Why it matters: The vaccine sidesteps the immune-tolerance barrier that has stalled prior sperm-protein contraceptive attempts by targeting a protein females already recognize as foreign. With 59–67% fertility reduction demonstrated and a three-year horse trial underway, wildlife managers could gain a long-lasting tool for feral horse, deer, and swine overpopulation.
