Immunocontraception and other fertility control methods offer a welfare-positive alternative to lethal culling for population management of some wildlife species.
Wildlife fertility control welfare is appealing because it reduces animal use (killing) while still addressing population management objectives. For some species and contexts — free-ranging horses in managed reserves, deer in accessible suburban areas — immunocontraception is technically feasible and delivers population management with lower welfare costs than culling. Its limitations are equally important to understand: it requires regular re-vaccination, it does not immediately reduce existing animal numbers, and it is impractical for large or inaccessible populations. A nuanced welfare assessment acknowledges both the genuine welfare advantages of non-lethal management where feasible and the practical limitations that may make lethal control necessary in some contexts.