How to Optimise Sheep and Wool Production

By Dr Duncan Houston

Improving wool production starts well before shearing day. Feed shortages, parasites, sore feet and weather stress can affect both the sheep and the fleece they grow.

A heavy fleece also needs to meet the requirements of its intended market. Clean wool yield, fibre diameter, staple strength and preparation all help determine what that wool is worth.

The aim is a healthy, productive flock that delivers valuable wool consistently while maintaining fertility, lamb survival and the condition of your land.

Quick Answer

Optimise sheep and wool production by matching genetics to your environment and market, providing consistent nutrition, and preventing avoidable disease. Measure clean fleece weight and wool quality alongside body condition, reproduction, survival and production costs. Prioritise parasite control, sound feet, reliable water, appropriate shelter and careful shearing, then use your records to identify the biggest losses.

What does good wool production actually mean?

Start by defining the type of wool you want to sell and the sheep enterprise you want to run.

A fine-wool Merino flock, a broader-wool flock and a dual-purpose enterprise can have different breeding and feeding priorities. NSW Government guidance identifies fibre diameter and clean fleece weight as major drivers of wool value, while liveweight also matters for reproduction and sheep sales.

Useful measurements include:

Measurement	What it tells you
Greasy fleece weight	The weight of the fleece before cleaning, including grease, dirt and other material.
Clean fleece weight and yield	How much usable clean wool the fleece contains. Yield expresses the clean proportion.
Fibre diameter	How fine or broad the fibres are, measured in microns.
Staple length	The length of the bundles of wool fibres, which affects processing suitability.
Staple strength	How well those bundles resist breaking during processing.
Vegetable matter and contamination	The presence of seeds, burrs, plant material or unwanted fibres.
Colour	Whether the wool meets the colour requirements of its intended market.

Objective testing helps establish these characteristics. Discuss your results with your wool broker or classer rather than judging the clip by appearance alone.

When comparing seasons, account for the months of wool growth. A fleece grown over a longer shearing interval is not directly comparable with one grown over a shorter interval.

Consistent nutrition protects wool quality

Wool grows continuously, and changes in nutrition can change fibre growth and diameter along the staple.

Research in Merino sheep found that maintaining liveweight produced more consistent wool growth and smaller changes in fibre diameter than a pattern of weight loss followed by weight gain. Nutritional fluctuations can contribute to weak points in the staple.

This makes feed planning important before pasture quality falls. Waiting until sheep are visibly thin means the nutritional shortfall has already occurred.

Aim to maintain appropriate body condition through predictable seasonal changes. Do not deliberately underfeed sheep to produce finer wool. Any apparent benefit in micron needs to be considered alongside fleece weight, strength, health and reproduction.

Choose feed according to what is missing

There is no single best feed for every wool flock. Requirements change with age, growth, pregnancy, lactation and the quality of available pasture.

Good pasture can support production, but an abundance of dry, mature grass does not necessarily provide enough usable energy or protein. Hay and silage also vary considerably in quality. Feed testing helps you choose supplements that address a real shortfall.

Use the different feed types for their actual purpose:

• Pasture and forage: The foundation of many sheep diets, with quality and availability assessed throughout the season.

• Grain or suitable pellets: Additional energy when the forage supply cannot meet requirements.

• Protein supplements: Useful when the overall ration lacks adequate protein.

• Roughage: Supports normal rumen function, particularly when concentrates form a substantial part of the diet.

Introduce grain gradually using a planned feeding programme. Sudden access to large amounts can cause grain poisoning, also called ruminal acidosis. Provide adequate feeding space and identify shy feeders that are missing out.

Condition-score sheep with your hands

A thick fleece can hide substantial weight loss. Feel the muscle and fat cover over the loin rather than relying on how rounded the sheep looks.

Assess condition at useful decision points, including before joining, at pregnancy scanning, before lambing and around weaning. Record the result so you can see whether particular mobs are improving or losing condition.

Set targets with your adviser for the breed and production stage. Repeated measurements are more useful than a single score taken after a problem develops.

Weighing adds useful information, but compare animals at similar stages and account for pregnancy and fleece weight.

Feed pregnant and lactating ewes as separate production groups

Pregnancy scanning allows you to distinguish dry ewes from those carrying singles, twins or triplets. Their nutritional needs differ, and multiple-bearing ewes need particular attention.

Where practical, allocate feed by pregnancy status and condition. Young ewes may also need to support their own growth.

Adequate nutrition around lambing supports ewe survival, colostrum and milk production, and lamb survival. Agriculture Victoria identifies pregnancy scanning, condition management and feeding according to reproductive status as central to managing multiple-bearing ewes.

A late-pregnant ewe that stops eating, becomes weak or cannot stand needs urgent veterinary attention. Pregnancy toxaemia and hypocalcaemia are important possibilities, and they can occur together. Increasing feed alone is not an adequate response to a clinically unwell ewe.

Use supplements for a defined reason

Before buying a mineral product, identify what your pasture, water and ration already supply. Regional deficiencies, feed analysis and appropriate animal testing can help guide the decision.

Sheep are particularly susceptible to copper poisoning. A cattle or goat feed, mineral mix or supplement may contain unsuitable amounts for sheep. Check the entire ration with your vet or nutritionist, including any overlapping supplements.

Selenium also becomes toxic in excess. Avoid combining mineral drenches, injections, blocks and fortified feeds without checking the total supply.

For any proposed production additive, ask: what problem is it correcting, what evidence supports its use in comparable sheep, and how will you measure whether it pays?

Match stocking rate and terrain to the flock

Set stocking rates according to available feed and its quality, with a plan for seasonal shortages. Ewes feeding lambs have different demands from dry sheep, so head count alone is an incomplete measure of grazing pressure. Walking distance and terrain also affect energy requirements.

Review the paddock from the sheep’s perspective:

• Can every animal reach water and suitable grazing?

• Are thin, lame or heavily pregnant sheep facing unnecessary walking?

• Are gateways and trough approaches persistently muddy?

• Is there enough sheltered ground for vulnerable mobs?

• Are seeds and burrs contaminating the fleece?

Use these observations when allocating mobs, improving access and planning pasture management. Maintaining groundcover and preventing avoidable feed shortages should be part of the production plan.

Water, shelter and housing affect performance

Provide clean, accessible drinking water and check the supply daily. Demand changes with weather, feed moisture and production stage. Trough capacity and refill rate must cope when the flock drinks together.

During hot weather, provide enough shade and airflow for the mob, with water nearby. Avoid crowding sheep into a small shaded corner or a congested trough area.

Cold rain and wind are especially dangerous for newborn lambs and recently shorn sheep. Put freshly shorn sheep into suitable shelter before bad weather arrives and ensure they have adequate feed. Protection matters for more than the first night after shearing.

Where sheep are housed or held in containment areas, provide dry resting areas, drainage, ventilation and enough space to access feed and water. Monitor timid animals and those that fall behind.

Control worms with testing and a regional plan

Internal parasites can reduce performance before every affected sheep looks obviously ill.

Use a programme suited to your region, rainfall pattern, flock and grazing system. It should combine worm egg counts, effective treatments, checks for drench resistance, grazing management and appropriate nutrition. Breeding for worm resistance can contribute over time.

Do not assume the same drench on the same calendar date will remain effective indefinitely. Your vet or adviser can help interpret tests and decide when treatment is required.

Persistent poor condition or diarrhoea also needs investigation rather than repeated blind drenching. Feed problems, dental disease and other illnesses may require a different response.

Prevent flystrike and investigate fleece damage

Flystrike prevention needs several measures working together: regular inspection, appropriate crutching and shearing, management of dags and scouring, suitable preventative treatments, and breeding decisions.

Follow product directions, including relevant meat withholding periods and wool harvesting intervals. Keep treatment records accessible to the shearing team.

Suspected flystrike needs immediate attention. A sheep biting at its wool, separating from the mob, or developing damp, discoloured, foul-smelling fleece needs close inspection. Maggots beneath the fleece confirm an active strike.

Treatment involves exposing and removing affected wool and maggots, using an appropriate registered treatment and monitoring recovery. Contact your vet urgently if the sheep is dull, weak or extensively affected, or you cannot treat it promptly. A preventative product alone may not adequately treat an established strike.

Rubbing and ragged wool can also indicate lice, but irritation has other causes. Examine affected sheep and establish the cause before selecting treatment. Include introduced sheep in a biosecurity plan even when they appear clean.

Protect feet and treat lameness promptly

Foot care means identifying why a sheep is lame and treating that cause.

Footrot, interdigital inflammation, abscesses and injuries require different management. Separate animals with suspected infectious foot disease and seek advice on a flock control programme.

Avoid routinely trimming every foot or aggressively cutting diseased tissue. Research on footrot found that foot trimming delayed recovery in affected sheep. Trimming should be based on a specific need and appropriate guidance.

Improve persistently wet areas and make feed and water easy for recovering sheep to reach. A lame sheep should receive attention promptly, rather than waiting for the next scheduled yarding.

Breed for lifetime performance

Choose breeding stock for a balanced set of traits suited to your environment.

For a wool enterprise, these may include fleece weight, fibre diameter, staple length and strength, alongside fertility, survival, worm resistance and physical soundness.

Australian Sheep Breeding Values can inform selection, combined with visual assessment and your flock’s performance records. Australian Wool Innovation’s Merino Lifetime Productivity project demonstrates why wool, reproduction and other traits need to be considered together.

A ram selected for one impressive wool measurement may not deliver the best overall result for your farm.

Protect wool value at shearing

Choose shearing timing with your wool adviser, considering staple growth, market requirements, weather, lambing and parasite management.

Use competent shearers and an appropriately trained wool classer. Australian wool classers registered with AWEX work to a code covering clip preparation.

Before shearing:

• Confirm that sheep and wool are dry enough.

• Clean the shed and remove twine, feed bags and other potential contaminants.

• Provide suitable wool packs and clear identification.

• Share treatment histories and wool harvesting restrictions.

• Identify mobs requiring separate handling or preparation.

Separate stained and contaminated wool as directed by the classer, and keep the prepared clip clean and dry. Good preparation preserves the value already grown on the sheep.

If considering more frequent shearing, compare annual wool income with the additional shearing, labour and handling costs. Include animal welfare and weather exposure in that decision.

Which problems need veterinary attention?

What you notice	What it may indicate	What to do
Lower fleece weight or strength, with otherwise well sheep	Nutrition, seasonal stress, genetics or a change in shearing interval	Review feed, condition records and wool tests with your advisers.
Persistent weight loss, diarrhoea, rubbing or lameness	Parasites, skin disease, foot disease, dietary problems or another illness	Arrange prompt examination and targeted testing.
Damp, smelly wool or visible maggots	Flystrike	Inspect and treat immediately; seek urgent veterinary help if the sheep is unwell or treatment is not readily available.
A pregnant ewe off feed, weak, staggering or down	Metabolic disease or another serious illness	Contact a vet urgently.
Sudden deaths, severe breathing difficulty or several rapidly deteriorating sheep	A potentially serious flock problem	Contact a vet immediately and seek advice before moving or mixing stock.

The useful distinction is whether you are reviewing a production trend or dealing with a sick animal. A production review must not delay treatment.

Build prevention into the flock calendar

Plan health management around joining, lambing, weaning, shearing and seasonal risks. Vaccination should reflect local disease risks, the animals involved and the product’s directions, including required boosters.

Discuss purchased-stock health information, quarantine, disease testing and equipment hygiene with your vet. A National Sheep Health Declaration can help assess risks when introducing sheep.

Use calm handling and well-maintained yards. Schedule necessary procedures thoughtfully so repeated disruption does not interfere unnecessarily with feeding, lambing or recovery.

What should you do next?

1. Review the last clip. Identify the main limitations in clean yield, fibre diameter, strength, length or contamination.

2. Assess the sheep. Record condition, weight trends, lameness, parasite problems and reproductive outcomes by mob.

3. Plan the next feed gap. Match available feed to expected requirements and arrange supplements before condition falls.

4. Choose the biggest preventable loss. Focus first on the issue most likely to improve welfare and performance.

5. Measure the outcome. Compare results over a consistent period and include the cost of the change.

Track clean wool produced per sheep per year, wool income after relevant costs, ewe and lamb survival, and lambs weaned per ewe joined. For a dual-purpose enterprise, include lamb growth and sale returns.

Electronic identification can help connect individual records, but a consistent, well-kept mob record is also useful. Data only helps when it changes a decision.

Common mistakes that reduce performance

• Selecting for fleece weight while overlooking quality, fertility or survival.

• Waiting for obvious weight loss before adjusting nutrition.

• Assuming a livestock supplement is safe for sheep.

• Repeating ineffective parasite treatments without investigating resistance.

• Ignoring sore feet or rubbing because the mob still appears to be grazing.

• Comparing fleece weights without allowing for different wool growth periods.

Can feeding more protein increase wool production?

It can help when protein supply is limiting. Assess the whole ration first, because additional protein does not correct inadequate energy, poor access to feed or untreated disease.

Should I shear more often to produce more wool?

Changing the interval changes when wool is harvested. Assess whether the resulting staple length, clip value, costs and welfare outcomes improve your annual result before changing the schedule.

Does every thin sheep need drenching?

No. Worms are one possibility, but inadequate nutrition, dental problems and other diseases also cause weight loss. Use examination and appropriate testing to guide treatment.

Is the finest wool always the most profitable?

No single micron target suits every enterprise. Evaluate fibre diameter alongside clean fleece weight, other quality traits, production costs and the flock’s reproductive performance.

Start with the part of your system that is losing the most value. A targeted change, followed by reliable measurements, gives you a practical basis for deciding what to improve next.

For a conversation with ASK A VET™, have your flock health history, condition records, feeding plan and wool test results ready. These details help make questions about production more useful, while sick sheep still need prompt attention from your local veterinarian.