Why Continuous Grazing Wears Pasture Out

Left to their own devices, livestock will graze the sweetest patches of a field down to the bone while leaving rank, stemmy tufts untouched. Over a season this creates a patchwork of overgrazed and undergrazed ground, and neither is healthy. Overgrazed plants are forced to draw on root reserves to regrow, so their root mass shrinks, the sward thins, and bare soil appears — an open invitation to docks, thistles and chickweed.

There is a worm angle too. Most infective larvae climb only the first few centimetres of grass, so animals grazing tight to the ground take in a far heavier dose than those grazing taller herbage. Continuous grazing on the same few acres keeps the cycle turning. A rotation breaks it.

How a Rotation Actually Works

The principle is simple: give stock a smaller area for a short time, then move them on and let that area rest. You are managing three things at once — how long animals graze a paddock, how tall the grass is when they go in, and how long the ground gets before they return.

Two numbers are worth committing to memory. Aim to turn animals into a paddock when the sward is roughly 8–10cm tall, and move them out at around 4–6cm. Sheep can go a little tighter than cattle, but nothing should be scalped. If you are walking onto a paddock and thinking "there is nothing left here", you have stayed a day too long.

Back fencing matters more than most beginners expect. If animals can wander back over ground they have already grazed, they will nibble the fresh regrowth before it has recovered, and you lose much of the benefit of resting it. A strand of electric fence behind the mob solves this cheaply.

Working Out Paddock Size and Rest Periods

Rest periods are not fixed. They should follow grass growth, which is entirely weather-driven.

• Fast spring growth: 14–21 days of rest is often enough, and you may be moving stock every one to three days.
• Early summer, good moisture: 21–30 days.
• Drought or midsummer slump: 40 days and upwards. Growth slows, so you must slow the rotation with it.
• Late autumn and winter: 60–90 days, or simply shut some ground off entirely and feed conserved forage elsewhere.

A useful rule of thumb for perennial ryegrass is the three-leaf principle: a plant needs to grow roughly three new leaves before it is ready to be grazed hard again. In warm, damp conditions that happens quickly; in a cold snap it can take weeks. Watch the grass rather than the calendar.

To size paddocks, estimate how much forage your stock need per day, then divide your total grazing area accordingly. As a rough guide, a mature ewe with lambs eats around 2–3kg of dry matter daily, and a suckler cow closer to 12–14kg. Add 20–30% to your calculations as a buffer, because no rotation runs to plan in a wet October.

Matching the System to Your Soil and Climate

The wetter the ground, the more paddocks you need and the smaller they should be. Heavy clay in the west can poach badly in winter; on those soils, keep paddocks tight and move stock often, or rest the wettest fields altogether between November and March. Sandy or chalky ground in the east drains well but dries out fast, so summer rest periods there may need to stretch well past 40 days.

Slope, aspect and altitude all shift things too. A south-facing field dries and greens up a fortnight before a north-facing one at the same height. If you have a mix of ground, use the early fields for spring grazing and hold the later ones for summer or autumn.

Water access is the quiet limiting factor. Every paddock needs a trough or a reliable natural supply within reasonable walking distance, or stock will camp near the gate and create a mud patch. Plan the layout around water before you plan it around fence lines.

Reducing Worm Burdens Alongside the Rotation

Rest is one of your best worm tools, but it works best alongside other measures. Larvae need moisture and warmth to survive, and most do not live much beyond a few weeks on the pasture surface. A rest period of three to four weeks in mild conditions will substantially reduce the number of infective larvae waiting for your animals.

• Graze mixed species where you can — cattle and sheep take in different worm species, so alternating them helps dilute the burden.
• Move youngstock onto the cleanest, longest-rested paddocks first, and follow with older, more resilient animals.
• Avoid grazing newborn lambs or calves on ground that carried youngstock the previous season.
• Keep an eye on condition and dagging rather than relying on routine dosing; work with your vet on faecal egg counts to decide when treatment is genuinely needed.

Remember that a small amount of exposure builds natural immunity, particularly in adult animals. The goal is not a sterile pasture — it is a pasture where the challenge stays manageable.

Starting Small and Adjusting as You Go

You do not need twelve paddocks to begin. Four or five will do for a first season, using temporary electric netting and a reel of polywire. Set up a simple rotation, walk the fields regularly, and note what happens. Most smallholders find they are moving stock more often than they expected in May and far less in August.

Expect to adjust constantly. A dry spell, a late frost, a flock that suddenly grows — all of it changes the plan. That is not a failure of the system; it is the system working. The habit of moving animals, watching the grass recover, and letting the ground tell you what it needs is worth far more than any tidy timetable.