Immunocontraception and other non-lethal fertility control methods offer welfare-superior alternatives to culling for managing overabundant wildlife populations in some contexts.
Wildlife contraception represents a significant welfare advance over lethal culling in appropriate contexts. Culling disrupts social group structures, causes acute suffering and may produce compensatory reproduction in some species. Immunocontraception preserves group integrity, avoids killing, and when well-managed can control population growth effectively. Welfare limitations of contraception include the stress of repeated darting for vaccine delivery and the management resource requirements that make it impractical at very large scale. The welfare calculation favours contraception when social disruption from culling is significant, when the species has complex social structures and when management resources allow ongoing delivery. Context-specific assessment is essential.