Operational Context

Selective culling is a targeted population management and disease-control tool used to remove specific individuals while retaining the remaining herd, flock, or wild population.

In livestock, selective culling for infectious disease control removes clinically affected or test-positive animals — ASF in pigs, bovine tuberculosis in cattle — to limit transmission while preserving breeding stock and herd continuity. Productivity culling removes dairy and beef cows on the basis of low milk yield, reproductive failure, lameness, or age; cull cows form a distinct slaughter class in beef processing supply chains.

In wildlife management, selective culling targets reservoir host species — badgers for bovine tuberculosis, wild boar for ASF, deer for chronic wasting disease — in attempts to reduce disease prevalence without eliminating the entire population. In conservation and invasive species management, targeted removal of specific size classes, sexes, or high-impact individuals is used to alter population structure or reduce ecological impact.

The production logic retains non-target animals and valuable genetics, avoiding the economic cost of whole-herd depopulation. Selective culling targets individuals assumed to contribute disproportionately to transmission, productivity loss, or ecological impact, at lower intervention cost than full depopulation or large-scale non-lethal controls.

Biological Impact

Selective culling produces physiological and behavioural impacts through handling, restraint, transport, and killing, and at population level through disruption of social structures and disease dynamics in remaining animals.

Handling, restraint, and transport involved in pre-culling operations produce elevated heart rate, cortisol, and catecholamine levels in cattle and pigs, documented across pre-slaughter handling and culling operations.

Killing method-specific physiological outcomes vary. Captive bolt followed by exsanguination produces physical disruption of brain tissue; misplacement can result in incomplete disruption and prolonged sensibility. Firearms to the brain produce structural disruption; non-fatal shots produce severe injuries and prolonged incapacitation. Electrical stunning induces a generalised epileptiform seizure; inadequate current or electrode contact is associated with incomplete loss of consciousness. Cervical dislocation in poultry causes spinal cord transection and cerebral ischaemia; incomplete dislocation is associated with prolonged convulsions.

At population level in wildlife, partial culls can produce perturbation effects — increased movement, altered social structure, and elevated inter-individual contact rates. Modelling and empirical work document that intermediate-coverage culling can increase disease prevalence by promoting density-dependent dispersal and mixing among survivors.

For ASF in pigs, selective culling that leaves infected animals in the herd for extended periods — pending diagnosis or incomplete removal — extends the infectious period within the farm and can increase viral spread. A farm-level study in Vietnam documents that this approach can exacerbate ASF transmission where not combined with early diagnosis and thorough removal.

In dairy systems, surveys document that cull cows are frequently transported or held for extended periods before killing. A 2014 survey in Piedmont, Italy found that on-farm euthanasia or killing represented approximately 1.6% of severely compromised cattle cases, indicating that most animals were instead subjected to prolonged management or transport before slaughter, with associated extended exposure to pain and stress from existing conditions — lameness, metabolic disease, and reproductive disorders among the primary documented causes of culling.

Wildlife culling programmes document direct mortality of target animals and incidental capture or death of non-target individuals, though quantitative non-target injury rates are not systematically reported.

Scale & Distribution

Global prevalence: Medium
Primary regions: Europe, East and Southeast Asia, North America, selected African, Latin American, and Oceanic countries
Species coverage: Broad — major livestock species in all regions; multiple wildlife taxa in disease-control and conservation contexts
Trend: Variable by region — embedded in routine herd management globally; disease-specific selective culling expanding in ASF-affected regions; wildlife culling programmes localised

Selective culling is embedded in routine dairy and beef herd management globally as a standard component of productivity and health management. Disease-specific selective culling strategies for ASF in pigs are documented in Vietnam and are under consideration or partial implementation in other ASF-affected regions in Asia and Europe. Wildlife culling as a disease and zoonosis risk-management tool is documented across at least 35 case studies globally, primarily targeting mammalian reservoir hosts. Intensity and form vary substantially: high and continuous in intensive dairy and pig sectors; periodic and geographically targeted in wildlife disease-control; context-dependent in conservation and invasive species management.

Regulatory Framing

Selective culling is governed through general animal welfare, slaughter, disease-control, and wildlife management legislation rather than through a dedicated regulatory instrument for the practice.

In the European Union, Council Regulation (EC) No 1099/2009 on the protection of animals at the time of killing specifies requirements for stunning methods, operator competence, and equipment for on-farm killing and emergency disease-control culling. Regulation (EU) 2016/429 — the Animal Health Law — and subordinate acts govern disease-control measures including killing of infected or suspect animals and carcass disposal for listed diseases such as ASF; member states may authorise partial depopulation under defined veterinary supervision and biosecurity conditions. Wildlife selective culling is further addressed under the Habitats Directive (92/43/EEC) and Birds Directive (2009/147/EC), which regulate taking of protected species and specify that derogations for disease control, serious agricultural damage, or public safety require permit and reporting systems.

In Vietnam and other ASF-affected Asian countries, national ASF control regulations provide for culling of infected and in-contact pigs. Selective culling is sometimes implemented at farm level, but recent analyses note that partial or selective culling for ASF is not endorsed as a standard containment method under WOAH guidance, which generally favours full stamping-out or compartmentalised approaches.

WOAH Terrestrial Animal Health Code provides general standards on killing of animals for disease control, specifying that methods are to cause loss of consciousness and death while minimising avoidable pain, and that carcass disposal meets biosecurity requirements. The Code describes conditions for stamping-out and emergency slaughter.

National wildlife acts and hunting regulations — including the UK Protection of Badgers Act 1992 with licensed culling for bovine tuberculosis, and US state wildlife codes — specify which species may be culled, permitted methods, quotas, demographic targets, areas, and seasons, structuring selective culling through licensing conditions.

Selective culling is permitted across the EU and most high-income countries under general welfare and disease-control frameworks, with restrictions on permitted methods and operator qualifications, and species- or conservation-related constraints for protected wildlife. In some lower-income regions, enforcement of welfare standards, documentation requirements, and diagnostic confirmation may be limited, producing heterogeneous implementation. Regulatory variation influences practice choice where producers in jurisdictions permitting partial depopulation can avoid mandatory whole-herd culling for certain diseases, with implications for disease-control outcomes and trade status.

Terminology

Selective culling, partial culling, partial depopulation, targeted culling, tooth extraction approach, selective removal, cull cow, emergency slaughter, special slaughter, wildlife culling, reservoir host culling, population reduction, targeted depopulation, stamping-out partial, disease-control culling, test-and-slaughter

Editorial correction notice

Key industries — taxonomy gaps: Selective culling operates across wildlife management, game hunting, conservation, and invasive species control contexts. None of these map to current child-level terms in the SE Industries taxonomy. Flagged for taxonomy review.

Biological impact — method-specific outcome data: Quantitative data on mortality, injury rates, and stress responses specific to selective culling — as distinct from general slaughter or non-selective depopulation — are sparse. Most biological impact data derive from general pre-slaughter handling literature rather than selective culling-specific studies.

Biological impact — wildlife non-target injury rates: Incidental capture or death of non-target individuals in wildlife culling operations is documented qualitatively but not systematically quantified. Published case studies likely over-represent formally managed or scientifically monitored programmes.

Biological impact — ASF selective culling generalisation: Farm-level evaluations of selective culling for ASF are concentrated in a small number of Vietnamese case studies. Large-scale controlled comparisons with full stamping-out are not available. Generalisability across production systems and regions is limited.

Scale distribution — documentation gaps: Wildlife culling operations that are localised, unauthorised, or undocumented are not captured in published case studies. Published global estimates rely on formally reported programmes and likely under-represent total practice scale.

Regulatory framing — enforcement data: Enforcement of welfare standards, documentation requirements, and diagnostic confirmation in selective culling operations in lower-income regions is not systematically documented. Practical implementation may differ substantially from regulatory text.

Primary Animals: Records for Wild Boar, Badgers, and Deer need to be created to link to this record.