The ovary-killing theory does.
It explains why the Assateague herd isn’t growing.
It also explains why recovery time goes up the longer they’re on it.
After five years, they don’t recover, they’re self-boosting.
The sperm-blocking hypothesis was cooked up so the advocates could sell the pesticide as a safe, reversible vaccine.
For a discussion of the adverse effects of PZP, go to page 30 in this report.
RELATED: If PZP Is Reversible, Why Hasn’t Assateague Herd Rebounded?
Western Horse Watchers Association 