How a defined deer cull is planned and run
A defined cull, planned around the land, carried out against an agreed requirement, and brought to a clear end.
The point at which a defined cull becomes the right step is usually not a single event. It is the accumulation of the same problems repeating: repeated crop damage year after year, young tree & hedge plantings that fail to get established, coppice that will not recover, clear browsing lines beneath the tree canopy and regeneration that never improves. The deer are not a background issue any more. They are a management problem that current control is not shifting.
A defined cull is brought in to reset the position. The aim is to bring the population back to a level that routine management can hold. That is the work Atlex was set up to do.
When this work is needed
The work suits land where the following are all present.
Scale of pressure
Deer numbers or spread have moved beyond what routine control or fencing is keeping in hand.
Level of damage
Damage to crops, hedges, trees, woodland, or forestry has reached a level that current deer management is not reducing.
Recorded result
The owner or manager needs a clear account of what the work achieved and how the position changed across the land.
Clear end point
The work has a defined, time-sensitive reduction requirement. It is not a standing arrangement for routine day to day management.
Before the cull begins
The land is assessed to establish its layout, access, deer hotspots by day and night, likely movement patterns, and practical limits. Thermal drones are used from the air to support this assessment.
Public presence, livestock, seasonal farming activity, neighbouring land, and local relationships all affect how the cull can be carried out and are considered at this stage.
Where a reliable baseline is not already in place, a thermal survey is conducted to establish the minimum population present.
Atlex then sets out what reduction is likely to be achievable on that ground, based on the numbers present, before any cull is agreed.
How the cull is conducted
The cull is carried out by the Atlex team. Initial pressure is applied in the first weeks of engagement. Every cull is recorded as it happens, building a running picture of how the reduction is progressing and how the deer are responding.
Deer adapt under sustained pressure. Movement patterns change, activity shifts toward night, and animals push to quieter or less accessible ground. That behavioural shift is visible in the cull rate data, and it is what determines what the work does next: continue daytime pressure, move to night time culling under the appropriate Natural England licences A16 or CL55 where granted, or rest the ground for several weeks to allow behaviour to settle before returning.
Activity is planned around land use, access, known deer behaviour, and public presence, and reviewed throughout against the requirement.
When the agreed reduction has been met, the cull ends. It is not extended beyond that point without agreement. The landowner is left with a factual record of what was achieved, how the result sat against the original requirement, and a deer population that current management can contain.
How long a cull takes
The most effective period runs from 1 November to 30 March. That is not five months of continuous work. The team comes in, applies sustained pressure in the early weeks, and then reads what the deer do in response.
Where the buck and stag seasons open from 1 August, earlier work is possible. The consideration is that culling males before November affects how females on the same ground behave for the remainder of the season. That trade-off is part of the planning conversation.
A reduction target can be set. A precise timeline cannot be promised. The deer respond to pressure in ways that no plan fully anticipates, and the cull is managed around that response. What can be said is that Atlex works to the target, not to the clock.
Cull rates
Cull rate, measured as deer per active day, shows whether the work is producing results and how the deer are responding to pressure. These figures are from completed seasons and are the basis on which future work is planned.
Daily cull rate
Solo
Average 3.9 deer per active day across 22 solo days, with a daily peak above 10.
Team
Average 11.8 deer per active team day across 39 team days, with two to six stalkers. Days above 20 when conditions allow.
Cull effort
Averaged 2.6 hours per deer in 2024/25 and 2.1 hours per deer in 2025/26. More than 90% of these culls were fallow, the species most heavily concentrated in herds and the one that places the greatest demand on coordinated team work.
How records are captured during the work, and what the landowner receives at the end of the season, is covered on the reporting and records page.
If the ground is carrying pressure that routine control is no longer shifting, the practical starting point is whether Atlex is a fit for that land.