Sheep Farming

Merino Sheep Grazing & Feed Management: The Complete Pasture Playbook

Everything you need to know about feeding and grazing Merino sheep for profit — from lambing through genetics ROI

Whether you're managing a late-winter lambing mob or assessing the true cost of a genetics upgrade, one thing ties every decision together: your feed base. How well you grow it, protect it, measure it, and match it to demand determines whether your sheep perform to their potential — or whether the season quietly chips away at condition, wool, and production.

This comprehensive guide brings together two of the most critical periods in a Merino sheep operation: the lambing pinch and the genetics investment decision. Both rely on exactly the same foundation — a pasture plan built around real numbers, smart rotation decisions, and a weekly habit of checking whether your farm is keeping up.

This guide has three sections:

In Section 1, I'll walk you through the lambing-ready grazing plan. You'll learn the right mindset for wet-soil conditions, a before-during-post lambing rotation rhythm, and the weekly checklist that keeps ewes and pasture on track.

In Section 2, I'll show you how to translate a genetics upgrade into a concrete feed plan. You'll learn how to set targets, calculate pasture demand, and use a growth-rate sanity check to make sure your feed base can actually support higher production.

In Section 3, I'll show you how to bring both systems together using Pasture.io — paddock-by-paddock covers, a feed wedge, growth-rate tracking, and a simple weekly routine that keeps you ahead of every decision.

By the end of this guide, you'll have clear answers to:

In Section 1:

• Why protecting the pasture base comes before chasing utilisation in late winter?

• What's the best grazing rhythm before, during, and after lambing?

• What should you measure weekly — and what can you safely ignore?

In Section 2:

• What is the hidden feed bill behind a genetics upgrade?

• How do you convert a performance target into a pasture demand number?

• How do you stop expensive genetics regret before it starts?

In Section 3:

• How do you build a feed wedge and use it to decide where to graze next?

• How does growth-rate tracking keep the genetics decision grounded?

• What does a practical weekly Pasture.io routine look like?

Let's start where the season puts the most pressure first — lambing in late winter.

 

One Platform, Two Problems

Whether you're managing a late-winter lambing rotation or tracking whether your genetics upgrade is nutritionally supported, the core information need is the same: you need to know, quickly, what your farm is growing and whether it matches what your stock need. That's what Pasture.io is built for.

You don't need a complicated system. You need a small number of reliable inputs that you check weekly — and a tool that makes the next decision obvious.

For Lambing: Build a Feed Wedge and Allocate with Confidence

Late winter is not the time for guesswork. The single most valuable thing you can do in the weeks before and during lambing is build a quick feed wedge from your paddock-by-paddock covers. This turns a mental juggling act into a ranked visual that makes trade-offs obvious.

Step 1: Build the feed wedge

In Pasture.io, use your paddock covers to generate a feed wedge — a ranked view of pasture availability across the farm. This immediately tells you:

• Which paddocks are too low to touch without causing long-term damage

• Which paddocks are ready to graze now

• Which paddocks are carrying the rotation and can afford to wait

Step 2: Allocate paddocks with purpose

Once paddocks are ranked by cover, you can make allocation decisions based on real data rather than habit or gut feel:

• Identify your lambing paddocks and set a cover floor — a minimum level below which you won't graze them

• Choose your "next to graze" paddocks based on both cover and soil risk, not just which one is convenient

• Keep a rotation length target in mind and adjust it each week as growth rates change

Step 3: Close the loop with residuals

After each grazing event, record what actually happened:

• Did you hit the residual you planned, or did it come out lower?

• Did the paddock cop visible damage due to wet conditions?

This feedback loop makes the next week's choices sharper. It also builds a record of which paddocks carry damage risk in wet years — information that's invaluable in future lambing seasons.

For Genetics ROI: Use Growth-Rate Tracking as Your Early Warning System

The genetics decision is made in August. The feed bill shows up in July the following year — or the one after that. Pasture.io's growth-rate tracking gives you a weekly early warning system that tells you whether your feed base is trending toward supporting the new target or quietly falling behind it.

A practical weekly routine:

• Check growth rates across the farm and on key paddocks. Are you trending up, flat, or falling? Growth rate trends are more informative than single-week snapshots.

• Compare growth vs demand for the class of stock carrying your genetics upgrade target. If you've calculated your extra feed requirement from Step 3 of the framework, you can directly compare it to what your paddocks are producing.

• Adjust the rotation before the problem shows up in animals. The point of tracking growth rates is to create lead time. If the trend says you're consistently short, you have days or weeks to pull levers — not hours.

The levers available to you when growth-rate tracking gives early warning:

• Bring in or activate conserved feed

• Adjust paddock allocation to protect quality for the highest-priority mob

• Reduce overall stocking pressure if the farm is genuinely below carrying capacity

• Use a short-term containment option to give pasture recovery time

Side by Side: How Pasture.io Supports Each Decision

Decision	What Pasture.io provides	What it replaces
Which paddock to graze next during lambing	Feed wedge from paddock covers	Mental estimate and habit
Whether to graze or stand stock off wet paddocks	Cover floor + soil risk tracking	Gut feel in the moment
Whether genetics upgrade is nutritionally supported	Growth rate vs demand comparison	No check at all
Whether ewe condition risk is building	Weekly supply vs demand trend	Waiting until you see it in the animal
When to bring in supplement	Early-warning supply shortfall signal	Reacting after condition slips

Putting It All Together: A Simple Weekly Routine

This routine takes 15–20 minutes. Done consistently, it keeps both your lambing rotation and your genetics feed plan on track:

1. Pull paddock covers from Pasture.io. Build or update the feed wedge.

2. Check rotation length. Are you on track, or do you need to adjust timing?

3. Check residuals from last week's grazing events. Did you hit your targets?

4. Check growth rate trend. Is your farm growing enough to meet current demand?

5. Compare supply vs demand for your critical mobs. Lambing ewes or upgraded genetics mobs first.

6. Make one decision — which paddock is next, and what's the allocation — and note it down.

The goal is not a perfect plan. The goal is a plan that keeps you one step ahead of the pressure, every week, so that problems show up as small adjustments rather than expensive emergencies.

The Takeaway

Genetics are expensive. Underfeeding is costlier — and sneakier, because it compounds quietly before it shows up in your figures. A late-winter lambing plan that damages your pasture base costs you feed for the rest of the season.

Both problems have the same solution: measure what your farm is growing, match it to what your stock need, and make your next decision based on real numbers rather than hope. Do that weekly, and you'll get through lambing with fewer surprises. Your genetics will actually have the nutritional platform they need to perform. And you'll be positioned to cash in on the spring lift rather than spending it playing catch-up.

 

Why Nutrition Is the Return on Your Genetics Investment

Buying better rams or retaining higher-quality replacements is a visible, exciting investment. The feed bill that supports it is invisible — until it shows up in ewe condition, lamb survival figures, or wool test results that don't match expectations.

The reality is this: genetics don't perform on good intentions. They perform on nutrition. Even in well-run systems, sheep routinely fall short of their genetic potential because the nutritional plane doesn't consistently match what the animal needs at the critical points in the production cycle.

And for Merino producers, the stakes on this are high. Poor or inconsistent feeding doesn't just reduce production — it can create fibre diameter variation and tenderness that hurts staple strength and specification. The wool you were hoping to sell at a premium gets discounted instead.

The Hidden Feed Bill Behind a Genetics Upgrade

When you buy better rams or keep better replacements, you're usually aiming for at least one of these outcomes:

• More lambs reared per ewe joined

• Faster lamb growth to heavier sale weights

• Heavier, more valuable fleeces

• More consistent wool quality across the clip

All of those outcomes need more nutrients, delivered more consistently. Wool growth responds to nutrient supply, and the limiting factors are often energy, protein, and amino acid availability — particularly during the periods of highest physiological demand.

So before you write the cheque at a genetics sale, the practical question to answer is: what extra pasture grown or conserved feed do you need to justify this upgrade?

You can work that out without a PhD. Here's a simple framework that keeps you honest.

A Four-Step Framework: Target → Intake → Demand → Rotation

Step 1: Choose one upgrade target you will actually manage for

The biggest planning mistake is trying to lift everything at once. Choose the single performance lever you genuinely expect this genetics decision to move first:

• Lift scanning-to-weaning conversion by X%

• Lift fleece weight by X kg clean per head

• Hold micron and staple strength through the winter-spring production dip

Clarity here is not just good planning — it's the only way to know whether the genetics are actually working or not.

Step 2: Identify the critical nutrition window for that target

Once you know what you're managing for, identify the 45–90 day window where nutrition must not dip. For reproductive targets, the critical period is almost always late pregnancy and early lactation. Requirements during this window can jump sharply — often several-fold — and ewes can physically struggle to eat enough pasture volume to match demand even when it's available.

If your genetics upgrade is designed to lift reproduction and lamb output, this is the period where the feed bill shows up first. It's not the whole year — it's a concentrated pressure window where shortfalls have outsized consequences.

Step 3: Convert intake into a pasture demand number

You don't need perfect figures for this. You need a directionally correct check that tells you whether your feed base can plausibly support the target:

Extra intake per head per day (kg DM) × number of head × number of pressure days = extra feed required (kg DM)

Here's a worked example. If your upgraded ewe flock needs just 0.25 kg DM/head/day extra during a 60-day pressure window, and you're running 1,200 ewes:

0.25 × 1,200 × 60 = 18,000 kg DM

That's 18 tonnes of dry matter of additional feed you must grow, save, or buy to support the genetics decision you just made. It's not a large number per head. But it adds up fast across a mob and a season.

This is the number that most genetics purchases never get. Not because farmers don't care — but because nobody translated the target into a feed demand figure before the sale.

Step 4: Build a rotation plan around where that feed comes from

Now the question becomes practical: week by week, where does that extra feed come from?

• If pasture growth can cover it: Set your rotation length and paddock allocation to protect residuals and keep quality consistent. Don't let pressure in the critical window tempt you into grazing paddocks too hard or too early.

• If pasture growth cannot reliably cover it: Decide early whether you will conserve feed ahead of time (hay, silage), supplement at the gate, reduce stocking pressure before the pressure window, or use a containment approach.

This decision matters specifically for wool quality. Big swings in nutrition — even temporary ones — can create fibre diameter variation and tenderness that weakens staple strength. It's not just a production issue. It's a specification and price issue.

The Sanity Check: Growth Rate vs Demand

This is where most genetics ROI falls apart — not in the ram catalogue, but in the weeks that follow when nobody is tracking whether the feed base is actually keeping up.

Ask yourself one plain question each week:

"Is my farm growing enough feed to support the new target without stripping ewe condition or sacrificing pasture?"

You can answer that with two numbers:

• Farm demand (kg DM/day): what your stock need in total across the farm

• Farm supply (kg DM/day): pasture growth rate × effective grazed hectares

If supply falls below demand for weeks at a time, the system pays the bill in one of three ways:

• Ewe condition drops, putting reproduction and lamb survival at risk

• Wool output falls and staple strength weakens

• The pasture base erodes, slowing recovery later in the season

All three outcomes cost more than any supplement or rotation adjustment you might have made earlier.

A "Before You Upgrade Genetics" Checklist

Before you commit to higher targets — whether at the National Merino Auction or anywhere else — work through these five questions:

1. What single performance target will you manage for first?

2. What is the critical 45–90 day window where nutrition must not dip?

3. How many tonnes of extra feed does the target require over that window?

4. Can your expected pasture growth supply it, on average, during that period?

5. If not, what is your planned source of extra feed — conserved, bought, containment, or reduced stocking pressure?

If you can answer all five before you buy, you've done the work that most farms never do. And you've given the genetics a realistic chance of performing.

The Mindset: Pasture Base First

Late winter is when two problems arrive at the same time. Feed pressure builds as ewes approach lambing and their requirements climb sharply. And wet soils reduce the amount of time you can safely put stock on pasture without causing lasting damage.

The temptation is to keep grazing hard to capture every kilogram of dry matter. But this is exactly the wrong priority when soils are saturated. Research summarised by DairyNZ shows that seriously pugged pasture in spring can produce around 40% less dry matter through the following season. That's not a short-term inconvenience — it's a feed deficit that follows you for months.

So the mindset shift is this: the goal in late winter is not "perfect utilisation." It is:

• Keep ewes settled, comfortable, and in target condition

• Preserve enough leaf and residual that pasture rebounds quickly when growth picks up

• Avoid irreversible soil and pasture damage — because you can recover from a small feed deficit, but a hammered pasture base takes the whole season to fix

You can recover from being a bit short on feed. You cannot easily recover from pugged and compacted paddocks across your best-performing blocks.

Before Lambing: Build a Feed Bank and Simplify Decisions

The work you do 3–6 weeks before lambing determines how much stress you carry during it. The goal is to arrive at lambing with enough cover on your key paddocks, a clear plan for your lambing mobs, and a pre-made decision about what happens if it gets ugly.

Step 1: Allocate feed to the mobs that cannot afford to slip

Your multiple-bearing ewes are first in the queue. They have the highest nutritional requirements, the most to lose from condition slippage, and the greatest sensitivity to disturbance and walking. When you're deciding which paddocks go to your lambing mobs, prioritise:

• Paddocks that are drier underfoot and less prone to pugging damage

• Paddocks close to water (to minimise walking)

• Lower-traffic areas with fewer gateways and less congregation risk

• Paddocks with shelter if lamb survival in your environment depends on it

The goal is to put the most vulnerable mob onto the safest, least-damage-prone ground before the pressure hits.

Step 2: Pre-select your sacrifice area

This is the decision that most farmers make too late. When it's raining sideways and you need to move stock urgently, you don't have time to think clearly about where to concentrate damage. Make the call now, not then.

Your sacrifice area options:

• A run-down paddock you were planning to renovate anyway

• A laneway plus a sacrifice corner

• A feed pad or containment area if you have one

• Stubble or a well-drained holding paddock

The logic is simple: deliberate, concentrated damage in one chosen area beats accidental damage spread across your best paddocks.

Step 3: Set a simple pre-lambing rotation rule

You don't need a complicated system here. You need a rule simple enough that you and your team can apply it without debate when you're tired and the weather is bad:

• Lengthen the rotation as growth slows — don't graze paddocks before they've had time to recover

• Avoid re-entering the same paddocks too soon, even if covers look short

• Keep residuals sensible so plants have enough leaf to bounce back when temperatures lift

The point of a rotation rule is to take the decision out of the moment. Set the rule in advance, and then follow it.

Step 4: Lock in your "no-go" wet-soil conditions

Give yourself and your team a clear decision trigger — not a judgement call:

• If you're leaving deep hoof marks in the soil, you're doing damage

• If stock are camping gateways and walking tracks, pressure is too concentrated in one spot

• If you wouldn't drive a motorbike across the paddock without cutting it up, your sheep are doing the same thing with their feet

These aren't rules for perfect weather. They're rules for the moments when it's easiest to keep grazing instead of making a harder call.

During Lambing: Keep Ewes Settled and Minimise Disturbance

Once lambing starts, your priorities shift. Ewe disturbance is now a direct lamb survival risk. Your grazing decisions during this period need to balance pasture condition against keeping mobs calm and stable.

Option A: Set stocking for lambing mobs

Set stocking during lambing is not a compromise — it's often the right choice. It suits situations where:

• You need ewes settled and mothering-up without disruption

• Labour is stretched and you can't manage frequent mob movements

• Lamb survival and bond formation are the priority

The key is to implement it well rather than just defaulting to it:

• Set stock on the paddocks you chose earlier — drier ground, shelter if needed, close to water

• Keep stocking pressure realistic; don't put too many ewes on a paddock and then leave them until they've eaten it down to nothing

• Be ready to move or supplement if conditions deteriorate rapidly

• Avoid forcing ewes to walk long distances for water or feed — unnecessary movement is unnecessary risk during lambing

Option B: Controlled shifts for non-lambing mobs

For the rest of your farm — dry ewes, wethers, older lambs — a controlled rotation is still possible and valuable during lambing. The rules that make it work with minimal labour:

• Shift less frequently rather than more if time is tight (every 2 days rather than daily)

• Use bigger break sizes to reduce the time spent shifting fences

• Back-fence where you can to prevent re-treading and reduce tracking back through already-grazed areas

The benefit of keeping the rest of the farm in a rotation during lambing is that you come out the other end with paddocks that have had planned rest — rather than chaos on all fronts.

Wet weather tactic: on-off grazing

Agriculture Victoria describes on-off grazing as a proven strategy for reducing wet-soil damage — let stock harvest their intake, then move them off the paddock to limit treading and pugging. For sheep, the stand-off option doesn't need to be elaborate:

• A sacrifice paddock with hay

• A laneway system used as a holding area

• A containment area with supplementary feed

The principle is the same as for dairy: short, purposeful grazing windows on saturated ground do far less damage than leaving stock on all day.

Post-Lambing: Reset for the Spring Lift

Once lambs are up and going, the task changes from "survive late winter" to "capture spring growth." The farms that do this well are the ones that come out of lambing with a plan already in motion — not scrambling to repair damage and find feed at the same time.

Tighten the rotation carefully

As growth picks up in early spring, you can shorten the round — but don't rush it. Keep residuals high enough to fuel strong regrowth. Scalping paddocks in early spring to chase utilisation is one of the most common ways farmers lose momentum when the season should be paying out.

Clean up lambing paddocks

Lambing paddocks are almost always uneven after the season — grazed hard in some spots, barely touched in others. Your options:

• Light tidy-up graze with a different class of stock, if available

• A quick mechanical top if it's practical and conditions are suitable

• Leave it alone if conditions are still wet — more treading does more harm than the untidy pasture

Triage damaged paddocks early

As soon as conditions allow you to walk the farm, identify any pugged or compacted areas:

• Light damage often recovers with rest and warmer soil temperatures

• Moderate to severe damage may need physical repair or renovation planning

The earlier you identify the problem, the more options you have. A paddock you know needs renovation in October is one you can plan for. A paddock you discover in December that's been grazed hard on the assumption it was recovering gives you much less room to move.

The Weekly Checklist: What to Measure and Why

You don't need to measure everything. You need to measure the few things that drive good decisions consistently. Here's the weekly checklist that keeps a lambing rotation on track:

What to measure	Why it matters
Paddock covers (pasture mass)	Tells you what you have paddock-by-paddock, and whether your average farm cover is building or declining
Rotation length	Are you going to run out of grass before spring arrives?
Residuals	Are you leaving enough leaf for rapid regrowth, or are you scalping?
Growth vs demand	Is pasture growth keeping pace with what your stock need, or do you need supplement or containment?
Feed on hand (supplements)	How many days of buffer do you actually have in reserve?
Soil conditions and damage risk	Where is it too wet to graze without paying for it later?

If you're only doing one thing, measure paddock covers. Everything else becomes easier once you can see what you actually have — not what you think you have.

The "Don't Do Irreversible Damage" Rules

Use these as decision triggers when the weather and pressure make it tempting to just keep grazing:

• Don't chase utilisation on saturated soils. Treading damage is cumulative and hard to undo in a single season.

• Stand stock off sooner than you think. Short on-paddock grazing windows followed by off-paddock time reduce pugging risk significantly.

• Concentrate damage deliberately. A chosen sacrifice area absorbs the cost. Accidental damage across your best paddocks costs you far more.

• Reduce walking and congregation. Multiple access points, closer water, and avoiding long narrow breaks all reduce the traffic damage that comes from stock bunching.