S4ag Fencing

Fencing

Good fencing is the delivery mechanism for every rotational grazing and land management decision you make. A paddock system that allows genuine rest periods is not a luxury — it is the physical infrastructure of soil biology recovery. Without the ability to move stock rapidly and keep them out of an area long enough for roots and mycorrhizal networks to rebuild, rotational grazing stays theoretical. This skill helps you choose the right system, size the infrastructure, plan the layout, and keep it working.

How this skill works: Each sub-tool pauses at a Checkpoint to confirm the assumptions it is about to build on before producing output. A recommendation built on a wrong assumption wastes time and money — confirm the checkpoint before acting. Each sub-tool ends with Next steps — the skills worth running once you have acted on this one.

Expert Lineage

The thinkers whose frameworks underpin this skill — and what they specifically discovered that changes how you farm.

Jim Gerrish — Management-Intensive Grazing Gerrish spent decades at the University of Missouri Forage Systems Research Center before farming in Idaho, and his central finding is deceptively simple: the cost of the fencing system is rarely the constraint — the cost of not moving stock frequently enough is. His research established that paddock number matters more than paddock size; twelve paddocks managed well outperforms four paddocks at the same stocking rate every time. His practical contribution: the lane-based permanent infrastructure with temporary sub-division is the most cost-effective way to access the full range of rest periods a well-managed grazing system requires.

Joel Salatin — Low-Cost Rotational Systems Salatin's contribution is not to the theory of rotational grazing but to its economics. His polywire-and-step-in-post system at Polyface Farm demonstrated that effective rotational infrastructure could be installed for a fraction of conventional permanent fencing costs — and that the labour of moving temporary fencing is more than offset by the land recovery and animal performance gains. His specific finding: a single-strand electric polywire at appropriate height, properly trained to stock, controls cattle, pigs, and poultry more reliably than multi-strand permanent fence, at one-tenth of the capital cost.

Andre Voisin — Grass Productivity and Recovery Periods Voisin's 1959 work established the agronomic case for every fencing investment in this skill. He proved through rigorous observation that grass recovery after grazing follows a sigmoid curve — slow at first, rapid through the middle phase, then slowing as the plant reaches maturity. Returning stock during the rapid-growth phase, before the plant has fully recovered its root reserves, progressively weakens the sward. The practical implication for fencing: you need enough paddocks to give each area a rest period long enough to reach the rapid-growth phase. In temperate climates, that typically means 21–90 days, requiring a minimum of 8–12 paddocks at moderate stocking rates.

Allan Savory — Holistic Planned Grazing Savory's contribution to fencing design is the concept of the grazing cell — a central water point and lane system from which stock can access surrounding paddocks with minimum travel. His research in brittle environments demonstrated that the geometry of the paddock system affects how easy it is to implement planned grazing: paddocks equidistant from water and handling facilities reduce the labour cost of frequent moves enough that farmers actually do them. The fencing layout is not just functional — it is a behaviour-change design challenge.

Premier 1 Supplies — Electric Fencing Standards Premier 1's published technical guidance, accumulated over four decades of fencing supply and support, constitutes the most comprehensive practical reference for electric fencing system design available to farmers. Their specific contribution: the earthing (grounding) system is responsible for the majority of electric fence failures, and most farmers underestimate by 3–5x the earthing stake length required for dry soils. A fence that reads 6,000+ volts with a good voltmeter and collapses to 2,000 volts under load has an earthing problem, not an energiser problem.

Temple Grandin — Animal Behaviour and Infrastructure Design Grandin's research on animal movement through infrastructure directly informs fencing layout decisions. Her finding: livestock move better toward light, on curves rather than sharp corners, and will balk at shadows, reflective surfaces, and sudden contrasts. Applied to fencing: race and laneway design that follows her principles reduces the labour required to move stock between paddocks — which determines how often moves actually happen. A technically adequate fencing system that stock resist moving through gets used less, not more.

Which tool fits

Routing Decision

• Starting from scratch, don't know which system to use → system-selection
• Have a system in mind, need to size energiser or diagnose a fault → electric-fencing
• Know you want rotational grazing, need to lay it out → rotational-infrastructure
• Losing stock to predators — foxes, dogs, birds → predator-exclusion
• Existing fence underperforming — stock escaping, voltage dropping → maintenance
• Unsure → system-selection first; it routes to the others

System Selection

Matches the fencing system to the enterprise, terrain, budget, and management intensity.

Before committing to any fencing investment, clarify what job the fence needs to do. Permanent fencing, temporary electric, and electric netting each have a correct application. The wrong system for the job costs more in the long run — either in capital, labour, or land management compromise.

Decision framework:

Step 1: What are you fencing?

Step 2: What permanence do you need?

Step 3: What terrain and soil conditions do you have?

• Rocky or steep ground: permanent fencing is harder to install and maintain; temporary electric is more adaptable.
• Sandy or dry soils: earthing is more difficult — budget for longer earthing stakes and check more frequently.
• Heavy clay: post driving is easier but posts move with frost heave; braced corners are critical.
• Wet ground: avoid energiser placements that may flood; consider elevated solar units.

Recommended approach for rotational systems:

Permanent perimeter + permanent lanes/races → temporary electric subdivision. This gives you the maximum flexibility to change paddock geometry as your grazing plan evolves, at the minimum ongoing labour once the permanent infrastructure is in.

Sustainability note: Timber from on-farm or locally milled hardwood for permanent posts reduces embodied carbon versus treated pine; split wooden posts last longer than round treated posts if species-appropriate. Solar energisers eliminate the running cost and CO2 footprint of grid-connected units where reliable sun is available.

Checkpoint — confirm before finalising:

• What species are being fenced, and are they currently trained to electric?
• What is the total perimeter length and approximate number of internal subdivisions planned?
• Is this primarily a capital budget decision, a labour availability decision, or a land management (rotational grazing) decision?

Recommending a system without knowing species and scale produces a plan that either over-spends on permanence or under-delivers on containment.

Output:

FENCING SYSTEM RECOMMENDATION

Enterprise: [species / enterprise type]
Scale: [total perimeter approx. length] [internal subdivision required]
Terrain: [terrain type and soil condition]

RECOMMENDED SYSTEM
Perimeter: [system type and specification]
Internal subdivision: [system type and specification]
Races / laneways: [yes/no — specification]

CAPITAL COST ESTIMATE
Perimeter: [$/£ per metre or per km]
Subdivision: [$/£ per unit or per km]
Total approximate: [$/£]

ONGOING LABOUR
[estimated moves per week / inspection frequency]

KEY CONSIDERATIONS
- [species-specific note]
- [terrain note]
- [training note if electric]

WHAT TO DO FIRST
[starting point — training paddock, perimeter first, etc.]

Next steps:

• Run electric-fencing (within this skill) to size and install the energiser system.
• Run rotational-infrastructure (within this skill) to lay out the paddock system once the system type is confirmed.
• /s4ag-livestock — the fencing system should be designed around the grazing plan, not the other way around.

Electric Fencing

Sizes the energiser, specifies earthing, trains stock, and diagnoses faults.

Electric fencing works on a biological principle: one reliable shock teaches an animal to respect the fence permanently. The system fails when voltage is inconsistent — intermittent shocks teach animals that the fence sometimes doesn't hurt, which is worse than no electric fence at all.

Energiser sizing:

The two key specifications are joules (output energy) and voltage (what the animal feels at the fence line). Joules is the capacity; voltage under load at the fence end is the measure of whether that capacity is being delivered.

Rule of thumb: Size up. The most common fencing mistake is undersizing the energiser. A 5-joule unit on a 2-joule job costs a little more; a 2-joule unit on a 5-joule job fails and costs you stock, time, and fence repair.

Earthing — the most common point of failure:

Electric fencing works in a circuit: energiser → fence → animal → ground → earthing stake → energiser. If the earthing is inadequate, the circuit does not complete and the animal does not feel the full voltage. Most fencing faults are earthing faults.

Stakes must be galvanised steel (not copper — different metals create galvanic corrosion and connection failures). Connect stakes in series, not parallel, with cable rated for underground use.

Diagnosing a failing fence:

Work through this sequence before assuming the energiser is faulty:

1. Measure voltage at the energiser output terminals (not at the fence) — if this is low, the energiser is the problem.
2. Measure at the fence line 50m from the energiser — if this is much lower, the connection between energiser and fence has a problem.
3. Walk the fence line with a voltmeter, measuring every 100–200m — a sudden voltage drop identifies the fault section.
4. Disconnect the earth and reconnect — if voltage jumps, the earthing is creating resistance (more stakes, drier-than-expected soil).
5. Check for vegetation contact systematically — a single dense clump touching the fence can drain a small energiser completely.

Voltage by contact point:

Training stock to electric:

Never introduce untrained animals to a large paddock bounded by electric fence. They will not understand the fence, will push through it, and may panic. Training protocol:

1. Set up a small training paddock (0.2–0.5 ha) with a reliable high-voltage fence.
2. Place good feed inside to encourage animals to approach and make contact voluntarily.
3. Leave animals in the training paddock for 3–7 days — by which point all animals have been shocked and learned the fence is the boundary.
4. Animals trained in this manner respect electric fence reliably for the rest of their lives.

Solar vs. mains-powered energisers:

Checkpoint — confirm before finalising:

• What is the total fence line length, and does it include netting runs or only wire?
• What is the typical vegetation contact situation — clean or heavy? This determines joule requirement.
• Is this mains-connected or remote (solar/battery)?

Sizing an energiser without knowing line length and vegetation contact produces a system that either underperforms or wastes capital.

Output:

ELECTRIC FENCING SPECIFICATION

Total fence line: [km or m]
Vegetation contact: [clean / moderate / heavy]
Power source: [mains / solar / battery]

ENERGISER
Unit output (joules stored): [joules]
Voltage target at energiser output: [V]
Voltage target at furthest point: [V]
Recommended unit: [specification or brand/model type]

EARTHING SYSTEM
Number of stakes: [number]
Stake length: [m]
Stake spacing: [m]
Notes: [soil condition notes]

FAULT DIAGNOSIS RESULT (if diagnosing existing system)
Fault located at: [location and fault type]
Remedy: [action]

TRAINING PLAN (if new animals)
Training paddock size: [ha]
Training period: [days]
Feed placement: [yes — inside paddock]

Next steps:

• Run maintenance (within this skill) to set an inspection schedule that keeps this system performing.
• Run rotational-infrastructure (within this skill) to lay out the paddock system this energiser will power.
• /s4ag-livestock — confirm that the energiser sizing is appropriate for your stocking density and move frequency.

Rotational Infrastructure

Designs the paddock layout, lane system, and water points for a rotational grazing system.

The paddock layout is not just a fencing question — it is a grazing planning question expressed in wire and posts. The geometry of your paddocks determines how easy it is to implement the recovery periods that drive soil biology recovery. A layout that is inconvenient to use gets used less. Design for the move you want to make, not the move that's easiest to install.

Step 1: Establish the required number of paddocks.

The minimum number of paddocks is determined by the recovery period required for your grass type and climate, divided by the grazing period per paddock.

In practice: if you cannot afford or install the full number of permanent paddocks, use temporary electric subdivision within larger permanent paddocks. A 40-paddock system can be achieved with 8 permanent paddocks and temporary sub-division.

Step 2: Design the layout.

The most efficient rotational infrastructure is a central-lane or spine-lane system:

    [P1] [P2] [P3] [P4]
     |    |    |    |
[W]=[====LANE====]==[W]
     |    |    |    |
    [P5] [P6] [P7] [P8]

W = water point   P = paddock   Lane = central access

Key design principles:

• Water every 250–400m maximum: stock will not graze further than this from water; distant corners become ungrazed dead zones.
• Lane width minimum 4m: enough for comfortable stock movement, machinery access, and avoiding poaching damage from concentrated stock.
• Lane surface: if used heavily in wet conditions, consider a gravel or woodchip strip at the gate/entry points where concentration is highest.
• Gate placement: gates at both ends of each paddock allow you to push stock through from behind rather than leading them.
• Shade consideration: map shade from existing trees before finalising paddock boundaries — shade areas are high-traffic and will compact; they should be at the edge of a paddock, accessible to stock, but not central.

Step 3: Size paddocks for your stocking density.

Paddock size = total grazing area ÷ number of paddocks.

For mob grazing (high-density, short-duration): paddocks are often less than 0.5 ha and are moved daily or twice daily. The temporary-within-permanent approach is essential here — you cannot afford (or manage) 60+ permanent paddocks.

For standard rotational grazing: paddocks of 2–10 ha depending on herd size and recovery period target.

Step 4: Plan water infrastructure.

Each paddock must have water access. Options:

• Permanent reticulated troughs: highest cost, lowest labour, best for fixed paddock systems.
• Mobile water trailer: lower capital, higher labour, suits mob grazing with frequent moves.
• Gravity-fed tank systems: intermediate cost and labour; requires elevation difference.

Water quality note: stock that drink from ponds and dams regularly have higher parasite and disease burdens. Exclude stock from natural water bodies using fencing and provide troughs fed from stored water.

Lane and race fencing specification:

Lanes must be robust enough to handle the full herd moving through them repeatedly:

• Permanent post and rail or post and high-tensile wire minimum.
• Three or four strands for cattle; sheep require either netting or electric strands to the ground.
• Width at handling facilities: 1.2m minimum for single-file race; 2.4m for drafting area.

Soil health note: The lane system is the most compacted area on any rotationally grazed farm. This is where biology can collapse fastest. Surface the heaviest-use sections. During wet periods, keep all stock moves brief and on the lane rather than across paddocks. Compacted lanes are worth addressing with aeration or biological decompaction (deep-rooted covers) during rest periods.

Checkpoint — confirm before finalising:

• Total grazeable area in hectares, and how many stock (in adult equivalents) are being run?
• What is the target recovery period — is this a standard rotation or mob/ultra-high-density?
• Is water infrastructure already in place, or does it need to be planned as part of this system?

A paddock design built on the wrong stocking density or without water placement will not function as intended.

Output:

ROTATIONAL INFRASTRUCTURE DESIGN

Total area: [ha]
Stocking rate: [AE — adult equivalents]
Target recovery period: [days]
Target grazing period per paddock: [days]

PADDOCK SYSTEM
Number of paddocks: [number]
Approach: [permanent / permanent + temporary subdivision]
Paddock size (approximate): [ha each]
Layout: [central lane / spine / other — sketch description]

LANE SYSTEM
Lane length: [m]
Lane width: [m]
Lane surface: [grass / gravel at gates / full gravel]

WATER POINTS
Number of water points: [number]
Type: [trough / mobile / gravity]
Maximum distance from water to paddock corner: [m]

GATE PLACEMENT
[description of gate strategy]

FENCING SUMMARY
Perimeter (permanent): [km]
Internal permanent: [km]
Temporary electric (for subdivision): [km of reel/polywire]

ESTIMATED CAPITAL COST
Permanent fencing: [$/£]
Water infrastructure: [$/£]
Temporary electric: [$/£]
Total: [$/£]

IMPLEMENTATION SEQUENCE
Phase 1: [what to install first — typically perimeter and lane]
Phase 2: [primary paddock subdivisions]
Phase 3: [water, secondary subdivision]

Next steps:

• /s4ag-livestock — the paddock layout should be confirmed against a grazing plan before installation begins.
• Run electric-fencing (within this skill) to size the energiser and earthing for the full system.
• /s4ag-water — water infrastructure within the paddock system connects to broader farm water management.

Predator Exclusion

Protects poultry and small stock from foxes, dogs, birds of prey, and other predators.

Predator exclusion is a different engineering challenge from livestock containment. Containment keeps animals in; exclusion must keep determined predators out. The two design principles are different: containment requires reliable deterrence; exclusion requires physical barrier. Most predator exclusion failures come from treating the two as equivalent.

Threat assessment by predator:

System options by enterprise:

Moveable electric netting (poultry day range): The most practical and cost-effective system for pastured poultry. 90–120cm height with closely spaced vertical strands and a powered bottom wire close to ground.

• Energiser minimum: 1 joule stored energy; 3,500V at the net under load.
• Net height: 90cm adequate for chickens contained; 120cm for ducks or geese.
• Stake spacing: every 3m in normal ground; closer on uneven terrain to prevent ground gaps.
• Key weakness: netting must be checked after rain and wind; sagging creates gaps at ground level.
• Move the net with the birds every 3–7 days — beyond 7 days on one area, the ground becomes hygienically compromised and the grass is gone.

Permanent electric exclusion fence (fixed poultry or small stock):

Five-strand system, with a buried or laid skirt:

Strand 1: 90cm — top wire, live
Strand 2: 60cm — live
Strand 3: 45cm — live or neutral (alternating improves current path)
Strand 4: 25cm — live
Strand 5: 10cm — live (critical for fox and dog exclusion)
Ground skirt: 30cm horizontal, pegged to ground (or buried 15cm)

Electric outrigger on the outside of the fence at 20cm height and 25cm out from the fence base eliminates digging before it starts — the animal gets a shock when it approaches to dig.

Permanent welded mesh (mink, weasel, stoat exclusion):

13mm or 19mm welded galvanised mesh. Stock netting (100 × 100mm or 150 × 150mm aperture) does not exclude mustelids or rats. For waterfowl, duck ponds, or rabbit enclosures:

• Welded mesh of minimum 13 × 13mm to ground level.
• Buried apron minimum 30cm, or concrete footing.
• Overhang or roller at top to prevent climbing.

Night housing — the most reliable exclusion:

No fence is perfectly reliable. For poultry, the highest-reliability predator exclusion system is automatic-door housing that closes at dusk and opens at dawn. A well-constructed coop with no gaps larger than 13mm, with a solid floor or hardware-cloth apron, means predator exclusion is a single point of management rather than a continuous perimeter challenge. Electric netting provides daytime protection; secure housing provides nighttime protection.

Livestock guardian animals:

In large-scale free-range systems where netting is impractical, livestock guardian dogs (LGDs) or alpacas can reduce predation significantly. LGDs require:

• Proper bonding to the flock from an early age.
• Adequate territory to patrol.
• Fencing appropriate to the LGD breed's drive (some LGDs escape weak fencing to patrol outside).

Alpacas are effective against dogs and foxes in daylight conditions; less effective at night or against persistent predators.

Checkpoint — confirm before finalising:

• What predator species are present or suspected — and is the primary risk from foxes, dogs, aerial predators, or mustelids?
• Is this a moveable (pastured) system or a fixed permanent housing system?
• What size and species of poultry or small stock are being protected?

A moveable electric netting recommendation for a mink-risk environment will fail; a permanent welded-mesh recommendation for a pastured day-range system creates unnecessary cost and eliminates the land management benefit.

Output:

PREDATOR EXCLUSION SYSTEM

Species protected: [poultry type / small stock]
Primary predator threats: [species list]
System type: [moveable / permanent fixed / hybrid]

RECOMMENDED SYSTEM
[Netting spec OR permanent fence spec]
  Height: [m]
  Strand/aperture: [specification]
  Ground treatment: [skirt / buried / concrete]
  Energiser (if electric): [joules / voltage target]

NIGHT HOUSING
Auto-door: [yes / no / recommended]
Coop specification: [any gap management notes]

LIVESTOCK GUARDIAN (if applicable)
[species recommendation and bonding note]

WEAK POINTS TO CHECK
- [specific vulnerability for this system]
- [seasonal or weather-related risk]

CAPITAL COST ESTIMATE
[$/£ for the system]

Next steps:

• Run electric-fencing (within this skill) to specify the energiser and earthing for the exclusion system.
• /s4ag-poultry — predator exclusion is one component of a complete pastured poultry system.
• Run maintenance (within this skill) to set an inspection schedule — exclusion systems fail at specific points and require more frequent checks than containment fencing.

Maintenance

Keeps the fencing system performing through regular inspection, fault-finding, and vegetation management.

A fencing system that works on installation day degrades continuously if not maintained. The primary causes of failure are vegetation contact, earthing degradation, mechanical damage (posts, strainers, connections), and corrosion. Systematic inspection catches these before stock escape or predator access.

Inspection schedule:

Voltmeter use:

Every farm operating electric fencing should have a digital fence voltmeter. Analogue units give a rough guide; digital units give the information you need to diagnose faults.

Test protocol:

1. Measure at the energiser output. Record.
2. Measure at the furthest point of the fence from the energiser. Record.
3. If the difference between 1 and 2 is more than 1,500V, there is a fault somewhere between the two points.
4. Walk the fence, measuring every 100m until you find where the voltage drops sharply — that is the fault section.

Vegetation management:

Vegetation contact is the primary cause of voltage loss in operating systems. One dense clump of wet grass touching a live wire can reduce voltage by 2,000–3,000V.

Management options:

• Spot spraying under fence lines: effective; consistent with conventional management.
• Grazing the fence line: run sheep, goats, or poultry on the fence line before moving other stock — they graze close to the fence where cattle won't.
• Mechanical slashing: labour-intensive on long runs; effective where livestock access is not possible.
• Insulated fence bottom: a single strand of insulated wire or tape run at ground level separates the live fence from vegetation; combined with a live wire above, maintains containment.
• Biological note: the strip of vegetation managed along the fence line is an opportunity — a diverse, unmowed margin supports soil biology, beneficial insects, and pollinator habitat. Where slashing is used, timing it post-flower rather than pre-flower captures the ecological benefit without compromising vegetation management.

Post and strainer maintenance:

Seasonal considerations:

• Wet seasons / heavy rain: earthing performance improves in wet soil — but waterlogged conditions can shift post stability. Check straining posts after significant rain events.
• Dry seasons / drought: earthing performance degrades. Add temporary water to earthing stake area, or add stakes. Stock pressure also increases as pasture runs out — check fence integrity more frequently.
• Frost heave: in cold climates, frost lifts posts. Spring inspection of post alignment is essential after a hard winter.
• Growth flushes (spring): vegetation contact increases dramatically as grass grows into the fence. Schedule a vegetation management run in early spring before the flush hits.

Record-keeping:

A simple fence inspection log — date, section walked, voltage readings, faults found and fixed — allows you to identify recurring weak points and predict maintenance needs. Fences that fail in the same place repeatedly have a structural cause that needs addressing, not just repair.

Checkpoint — confirm before finalising:

• Is this a maintenance schedule for an existing system, or a fault diagnosis for a specific problem?
• What type of system — permanent high-tensile, temporary polywire, or electric netting?
• Are there known weak sections, or is this a baseline inspection starting from scratch?

Treating a fault diagnosis as a routine maintenance task (and vice versa) produces the wrong output — a maintenance schedule for a system with an active fault still fails.

Output:

FENCING MAINTENANCE PLAN

System type: [permanent / temporary / netting / hybrid]
Total length: [km or m]
Current voltage (at furthest point): [V]
Status: [performing / underperforming / fault present]

INSPECTION SCHEDULE
Daily: [yes/no — what to check]
Weekly: [what to check]
Monthly: [what to check]
Seasonal: [what to check]
Annual: [what to check]

FAULT DIAGNOSIS (if applicable)
Fault location: [section description]
Fault type: [vegetation / earthing / break / corrosion / connection]
Remedy: [action and materials needed]

VEGETATION MANAGEMENT
Method: [spray / graze / mechanical]
Frequency: [how often]
Timing note: [seasonal consideration]

UPCOMING MAINTENANCE TASKS
1. [task — priority high/medium/low]
2. [task]
3. [task]

MATERIALS TO STOCK
- [item and quantity]
- [item and quantity]

Next steps:

• Run electric-fencing (within this skill) if the maintenance reveals an energiser or earthing system that needs upgrading.
• /s4ag-livestock — a functioning fence system should be reviewed against the grazing plan to confirm recovery periods are being achieved.
• /s4ag-seasons — schedule vegetation management runs and annual fence inspections into the farm calendar.