Porcine zona pellucida (PZP) immunocontraception was developed to provide a more humane, effective, and inexpensive method of population regulation for wildlife species. It has been used to regulate populations of several species including white tailed deer (Odocoileus virginianus), elk (Cervus elaphus ), black bear (Ursus americanus ), and the feral horse (Equus ferus caballus) with varying levels of success. Early studies on Assateague Island National Seashore, Maryland, USA, suggested PZP was as an ideal form of fertility control because it reduced the likelihood of conception to
Nuñez, Cassandra M.V.
"Consequences of Porcine Zona Pellucida Immunocontraception to Feral Horses,"
Human–Wildlife Interactions: Vol. 12
, Article 14.
Available at: https://digitalcommons.usu.edu/hwi/vol12/iss1/14