How to Optimise Mutton Production from Mature Sheep

By Dr Duncan Houston

Producing good mutton starts well before sheep reach the sale yards. The decisions that matter include which animals to retain, whether extra feeding is worthwhile, and when to sell before teeth, feet or declining condition become a problem.

Mature sheep need a different approach from growing lambs. A finishing programme should suit their health, feeding ability and target market, with animal welfare guiding every decision.

Quick Answer

To optimise mutton production, select healthy mature sheep, match their nutrition to an identified market, and monitor condition, weight and feeding costs. Check teeth, feet and underlying disease before assuming poor performance needs more grain. Sell when sheep meet the buyer’s requirements and further feeding no longer offers a worthwhile return, while they remain fit for the intended journey.

Understand what your mutton buyer wants

Mutton is meat from mature sheep. It commonly comes from ewes leaving the breeding flock and mature wethers. Commercial descriptions distinguish lamb, hogget and mutton, so confirm the buyer’s category and dentition requirements rather than relying on an animal’s estimated age.

Before feeding for a sale, ask about:

• Accepted sheep categories and breed types.

• Required carcase weight and fat cover.

• Discounts for animals outside specifications.

• Wool length, cleanliness and delivery requirements.

• Payment method and available carcase feedback.

A heavier animal does not automatically earn a better return. Extra weight only helps when its value exceeds the cost of producing it and the carcase still meets the market. MLA’s sheepmeat marketing guidance emphasises choosing a product and finishing system that suit the intended customer.

Choose suitable sheep before starting a finishing programme

Assess each animal’s condition, movement, mouth and health history. For ewes, include udder health and recent reproductive demands.

A ewe that has just reared twins may be lighter than a dry ewe because of lactation. That is different from unexplained weight loss in a sheep that has had adequate feed.

Useful candidates for further feeding are sheep that can eat comfortably, walk freely and respond to an appropriate ration. Persistent lameness, repeated illness or progressive wasting needs investigation before committing to a finishing period.

Culling from the breeding flock is a management decision. It does not necessarily mean an animal is sick. Agriculture Victoria recommends considering several traits together rather than automatically removing ewes because of one finding, such as worn teeth or low condition.

Plan these decisions early. Waiting until an older sheep is severely thin can remove both practical marketing options and its ability to travel safely.

Check feeding ability as well as teeth

Teeth become particularly relevant in older sheep. Worn or missing front teeth can affect grazing, while problems with the cheek teeth can interfere with chewing.

Watch for dropping feed, dribbling, slow eating or weight loss despite approaching the feeder. A sheep that appears interested in food may still struggle to consume enough. Persistent signs warrant a veterinary mouth examination and a review of how feed is presented.

However, tooth wear alone does not tell you how well a sheep is coping. Assess actual intake and condition alongside the mouth. Some animals with worn teeth maintain condition on suitable feed, while others struggle.

Do not assume that offering grain will solve every dental problem. The ration must remain balanced and appropriate for the animal’s ability to eat it.

Use body condition and carcase assessment alongside liveweight

Wool can hide substantial weight loss. Feel over the loin to assess body condition rather than judging the flock from a distance.

Body condition scoring helps assess reserves, while market fat scoring assesses carcase finish. Learn both methods and use them consistently; they answer related but different questions.

Liveweight also includes fleece and gut contents. Weighing under comparable conditions makes trends more useful. A heavier reading after a change in feeding does not, by itself, prove equivalent muscle gain.

Review weight, condition and the buyer’s fat requirements together. Avoid a single target weight for every breed, frame size and sheep category.

Build the ration around the mature sheep

The diet needs to supply maintenance requirements plus the nutrients needed to reach suitable sale condition.

Balance energy, protein, effective fibre, minerals and vitamins. Poor-quality forage may fail to provide enough usable energy even when there is plenty available. Equally, adding expensive protein without identifying a shortfall can increase costs unnecessarily.

Use feed testing and advice from a sheep nutritionist or veterinarian to match the ration to the animals and available ingredients. Dry mature sheep, lactating ewes and pregnant ewes should not automatically receive the same feeding programme.

Feeding option	Potential role	What to check
Good-quality pasture	Supports condition gain where supply and quality are adequate	Available feed, seasonal decline and actual performance
Hay or silage	Provides forage when grazing is limited	Feed analysis, spoilage, wastage and nutrient shortfalls
Grain or balanced pellets	Supplies additional nutrients where forage is insufficient	Gradual introduction, fibre, mineral balance and cost
Mixed ration	Allows controlled feeding in suitable facilities	Accurate mixing, consistent intake and access for all sheep

The right choice depends on what the sheep can eat, what the feed supplies and what the additional carcase value is likely to be.

Introduce grain carefully

Sudden access to large amounts of grain can cause ruminal acidosis, with reduced appetite, diarrhoea, weakness and potentially death.

Introduce grain or grain-based pellets gradually using a programme appropriate to the feed and previous diet. Maintain suitable roughage, feed consistently, and make sure less competitive sheep can access their share.

Inspect the animals daily during introduction. Watch individuals that hang back, stop eating or develop loose manure. Changes between grain types or batches also need care.

A rapid increase in feed is not a safe way to make up for lost finishing time.

Make water easy to reach

Provide clean, palatable water continuously. Check trough operation and refill rate, especially during hot weather or when sheep are eating dry feeds.

A full trough is only useful if every sheep can reach it. Consider approach surfaces, competition and the distance older animals must walk. Review water quality if consumption falls or the source changes.

Use supplements to correct a defined problem

Review the whole ration before adding minerals or feed additives. Ask what deficiency or limitation a supplement is intended to address and how you will measure the result.

Use feeds and mineral products formulated for sheep. Sheep are particularly susceptible to copper toxicity, which can develop through accumulation over time. Do not substitute cattle supplements or add copper without professional advice.

Male sheep also need attention to urinary stone risk. Diet and water intake contribute to stone formation, and obstruction can be life-threatening in wethers and rams. Have concentrated rations assessed for mineral balance rather than adding urinary treatments by guesswork.

No supplement can compensate for an animal that cannot reach the feeder or chew comfortably.

Investigate sheep that fail to improve

If the mob is progressing but a few sheep continue losing condition, assess those animals individually. If most of the mob underperforms, review the ration, feed access, water and wider flock health.

Possible explanations include inadequate intake, dental problems, parasites and other disease. Persistent wasting in adult sheep also warrants consideration of chronic conditions such as ovine Johne’s disease. Affected sheep may lose condition without obvious diarrhoea. Veterinary examination, testing and sometimes post-mortem investigation help establish the cause.

Do not repeatedly drench thin sheep without a parasite plan. Use worm egg counts, knowledge of drench effectiveness and regional advice to guide treatment and grazing management.

For purchased sheep, review health declarations and establish an arrival and quarantine plan with your vet before mixing them with the resident flock.

Prevent disease throughout finishing

Review vaccination history before moving sheep onto a higher plane of nutrition. Pulpy kidney, or enterotoxaemia, can cause sudden deaths associated with high carbohydrate intake or lush forage. Follow the appropriate vaccine label and your veterinarian’s programme, including any required primary course or boosters.

Plan flystrike prevention around the season, sheep condition, dags, crutching and shearing. Inspect susceptible sheep regularly; preventative treatment does not remove the need to look for active strike.

Record treatments accurately. Meat withholding periods and export slaughter intervals can differ, and wool harvest restrictions may also apply. Check the current product instructions and applicable intervals before setting a sale date.

Keep feet sound and ground suitable

Lameness needs a diagnosis. Footrot, foot abscesses and other foot problems require different management, and wet or muddy conditions can increase risk.

Check lame sheep promptly and seek veterinary advice for persistent, severe or spreading cases. Foot care should follow the diagnosis; routine aggressive trimming is not a universal treatment.

Choose finishing areas with sound footing and easy access to feed and water. For older sheep with reduced mobility, steep tracks and long walks deserve particular attention.

If sheep are housed or held in containment, provide adequate space, ventilation, drainage and dry resting areas. Observe whether all animals can eat and rest comfortably, including those at the back of the mob.

Plan for weather and shearing

Provide enough shade and shelter for the whole group. Position water so sheep can drink without long walks away from shelter.

Cold, wet and windy weather is especially concerning for thin, sick or recently shorn sheep. Plan shearing around forecast conditions, available protection and sale requirements. Freshly shorn animals may need additional shelter and closer observation.

Shelter helps sheep use dietary energy for maintaining condition and production instead of coping with weather exposure.

Protect meat quality through handling and processing

Mutton has its own eating characteristics. Age can affect flavour, meat colour and connective tissue, while the cut, processing method and cooking method also influence tenderness.

MLA reports that some hogget and mutton cuts can achieve high eating quality. Good nutrition and careful handling help protect that potential.

Move sheep calmly through well-maintained yards. Coordinate transport and delivery with the buyer, and avoid unnecessary delays. Confirm preparation requirements with the transporter and processor rather than applying a blanket period without feed or water.

Being booked for sale does not make an animal fit to load. Sheep must be able to cope with the intended journey. Severe weakness, emaciation, significant lameness or other conditions that would worsen during travel require an alternative plan.

Know which problems need prompt action

What you notice	What it may mean	What to do
Bright sheep with little improvement in condition	Feed quality, intake or finishing economics need review	Check access, ration and records before increasing feed
Repeated weight loss, dropped feed or ongoing lameness	An individual health or feeding problem	Arrange prompt assessment
Several sheep stop eating or develop diarrhoea after a feed change	A possible diet-related problem or disease event	Contact your vet the same day
Collapse, inability to stand, severe bloat or breathing distress	A potentially life-threatening problem	Seek immediate veterinary help
A male sheep repeatedly strains with little or no urine	Possible urinary obstruction	Treat as an emergency

Severe illness after grain exposure and suspected urinary obstruction need urgent assessment. Do not wait for the next scheduled weighing or sale.

Keep affected sheep calm and safely accessible for examination. Your vet can help decide whether treatment is appropriate or humane euthanasia is needed.

Measure whether extra feeding is paying

Record enough information to compare the value of selling now with the likely return from further feeding:

• Starting weight, condition and estimated sale value.

• Feed purchased, feed used and wastage.

• Labour, animal health and additional holding costs.

• Deaths and animals that fail to finish.

• Final sale income, transport charges and deductions.

• Carcase weights, fat results, trimming or condemnation feedback.

For sheep already on your farm, their current sale value is part of the decision. They are not free starting stock.

For example, if further finishing adds an estimated $35 per head to net sale proceeds but costs $42 per head, the additional feeding leaves you $7 per head worse off. These are illustrative figures, not market prices.

Review the calculation as feed costs, performance and buyer offers change. Set a planned review date and sale point before feeding begins.

A practical plan for the next group

1. Confirm the market. Obtain current specifications, delivery requirements and likely payment terms.

2. Assess the sheep. Record weight and condition, examine movement and feeding ability, and identify animals needing veterinary attention.

3. Cost the feeding period. Compare likely additional income with all extra costs and the option of selling now.

4. Monitor the response. Observe daily and schedule repeat weighing and condition assessment, often every two to four weeks for a stable group. Investigate illness immediately.

5. Act on the findings. Adjust the plan when performance disappoints and draft suitable sheep for sale as they meet requirements.

Use processor feedback to improve the next group’s selection, nutrition and sale timing.

Common mistakes that reduce returns

• Keeping older sheep until they are too thin or weak to transport safely.

• Assuming every poor performer needs more grain or another drench.

• Judging condition through the fleece without handling the animal.

• Feeding the whole group longer because a small number are behind.

• Ignoring current sale value when calculating finishing returns.

• Forgetting treatment restrictions when booking slaughter.

Can older ewes produce good-quality mutton?

Yes. Suitable older ewes can produce valuable sheepmeat. Their health, condition, handling and the buyer’s intended product all matter. Age alone does not describe every cut’s eating quality.

What is the best slaughter weight for mutton?

There is no single ideal liveweight. Use the buyer’s carcase weight and fat specifications, together with frame size, breed and expected dressing percentage.

Can mature sheep finish on pasture alone?

Yes, where pasture supplies enough usable nutrients and the animals can consume them. Monitor performance so declining pasture quality is identified before sheep lose condition.

Is grain finishing always more profitable?

No. Profit depends on feed cost, the animals’ response, the value added at sale and the time involved. Calculate the likely margin before starting.

Should a thin older sheep be fattened before sale?

First establish why it is thin and whether it can recover comfortably. Some animals respond to appropriate feeding; others have disease or dental problems that make a finishing programme unsuitable. A sheep that is unfit for transport needs veterinary advice and an appropriate welfare plan.

ASK A VET™ encourages early investigation of unexplained weight loss and declining performance. Bring your feeding records, treatment history and sale feedback to your livestock veterinarian so decisions reflect both the sheep’s welfare and your production goals.