There are now four different contraceptive products registered by EPA for pest or wildlife control,
OvoControl (nicarbazin) for pigeons,
Zona-Stat (porcine zona pellucida or PZP), immunocontraceptives for horses (and many other large, wild animals including elephants, elk and bison),
Gona-Con (gonadotropin-releasing hormone (GnRH)) by USDA Wildlife Services for white-tailed deer, and,
ContraPest (4-Vinylcyclohexene diepoxide and Triptolide) by Senestech for rats.
Each of the contraceptives builds on unique technological platforms with a similar biological outcome - interference with the reproductive system to slow or stop population growth.