How to Optimise Lamb Production for Meat

By Dr Duncan Houston

Producing better lamb starts long before the finishing paddock. Ewe nutrition, lambing conditions, early milk intake and weaning management all influence how many healthy lambs you eventually sell.

The aim is to produce lambs that survive, grow efficiently and meet the buyer’s requirements, while protecting welfare and keeping production costs under control.

A heavier lamb is only a useful improvement when the extra weight earns enough to justify the feed, time and management involved.

Quick Answer

Optimise lamb meat production by improving ewe condition and lamb survival, maintaining consistent growth and matching finishing diets to market targets. Provide reliable water, suitable shelter, healthy feet and effective parasite prevention. Track lambs weaned and sold per ewe joined, growth rates, carcase results and costs so you can identify where the biggest losses occur.

Start with the market you want to supply

Confirm your buyer’s requirements before deciding how heavy to finish lambs.

Consider the accepted carcase weight range, fat specifications, age or dentition requirements, eating quality expectations and any conditions attached to a particular production claim.

Regular weighing and assessment help you sell lambs when they meet the specification. Keeping an entire mob until the smallest lamb is ready can leave the larger animals overfinished.

Ask for processor feedback and use it when planning the next group. Meeting a suitable specification consistently is more useful than aiming for the heaviest possible carcase.

Measure performance from joining through to sale

For a breeding enterprise, a good finishing result does not compensate for avoidable losses at lambing.

Track:

• Ewes joined, pregnancy scanning results and ewe deaths.

• Lambs born where recording is practical, then lambs marked and weaned.

• Lambs weaned per 100 ewes joined.

• Weaning weights and subsequent growth.

• Deaths, treatments and persistent poor performers.

• Lambs sold, carcase compliance and kilograms sold per ewe joined.

• Feed, labour, animal health and other production costs.

If you purchase store lambs, record their source, entry weight, health history and total finishing costs.

Use consistent definitions. Comparing kilograms of liveweight with kilograms of carcase weight can make an apparent improvement meaningless.

Calculate growth rather than guessing

Average daily gain is:

Weight gained ÷ days between weighings.

For example, a lamb growing from 30 kg to 39 kg over 30 days has gained 300 g per day. That is an illustration, not a universal target.

Compare lambs of similar age, breed, sex and starting weight. Use consistent weighing conditions because gut fill and fleece can affect liveweight.

Regular weighing and fat assessment can reveal poor performers hidden within a mob average and help determine when lambs are ready for sale.

Choose genetics for the whole production system

Use Australian Sheep Breeding Values and an appropriate selection index alongside physical assessment.

Relevant traits include growth, muscle, fat, eating quality, reproduction and health. A terminal sire used to produce slaughter lambs has a different breeding role from a sire producing replacement females.

Balance growth and carcase traits with lambing ease and the needs of your ewe flock. If keeping replacement ewe lambs, include maternal performance and the cost of maintaining mature ewes in your breeding objective.

Sheep Genetics recommends selecting an appropriate index, reviewing important individual breeding values and checking structural suitability.

Feed the ewe to support lamb survival and growth

Assess ewe condition before joining and through pregnancy. Pregnancy scanning helps identify dry ewes and those carrying singles, twins or triplets so feeding can match their needs.

Multiple-bearing ewes need particular attention in late pregnancy and lactation. Thin ewes need timely support, while excessive condition and oversized single lambs can increase lambing difficulties.

Choose lambing paddocks with sufficient feed, accessible water and effective shelter. Smaller mobs can help reduce mismothering, particularly with multiple births, but the best mob size depends on the paddock and management system.

The objective is an appropriate birthweight and a healthy ewe able to rear her lambs. Simply pushing birthweight or scanning percentage higher does not guarantee more lambs sold.

Protect the first days of life

Much of the opportunity to improve lamb survival sits in the first few days after birth.

Watch for difficult births, weak lambs, poor mothering, inadequate milk intake and exposure to cold wind and rain. Check that lambs are standing and suckling, with particular attention to multiples and lambs from maiden ewes.

Provide shelter and minimise unnecessary disturbance of newly bonded ewe-lamb groups. Where births occur indoors or in small pens, clean, dry bedding and sensible stocking are essential.

A weak, cold lamb that cannot stand or suck needs prompt skilled help. Do not repeatedly force milk into its mouth, because it may inhale it. Have your vet establish a practical newborn assessment and treatment protocol before lambing.

Repeated lamb deaths deserve investigation, including whether starvation, infection, birth difficulty or exposure is involved.

Plan weaning before separating the lambs

Weaning removes the milk supply and changes the lamb’s social environment. It works best when lambs are already eating suitable solid feed and can find and use their water source.

Base timing on lamb age, weight, feed intake, ewe condition and available nutrition. Early weaning requires especially careful feeding and management.

Prepare paddocks with high-quality feed, low worm risk, minimal grass seed hazards and accessible water. Familiarise lambs with supplementary feeds and drinking equipment before weaning where practical.

Draft lighter lambs for appropriate support. They can have different nutritional needs from heavier lambs, and a reasonable mob average should not hide animals losing weight.

Match feed to the growth target

Growing lambs need sufficient energy, protein, effective fibre, minerals and vitamins. The right ration depends on liveweight, desired growth, feed quality and the production system.

Test supplementary feeds and assess pasture quality and availability. A paddock can contain plenty of standing material while providing too little digestible feed for finishing lambs.

Feed option	Where it can help	Main consideration
High-quality pasture	Supports growth in grazing systems	Intake depends on quantity, digestibility and access.
Suitable forage crops	Extend the supply of nutritious grazing	Introduce appropriately and assess crop-specific health risks.
Hay or silage	Provide forage and support the ration	Quality varies and may not meet growth requirements alone.
Cereal grain	Adds energy when the base diet is inadequate	Requires gradual introduction and a balanced ration.
Lupins or suitable protein meals	Correct a protein shortfall	Use according to the complete diet’s requirements.
Formulated lamb pellets	Provide a consistent supplementary or finishing feed	Check whether they are a complete ration or require added forage.

Review the feeding plan with a livestock nutritionist, especially for intensive finishing or very young weaned lambs.

Introduce grain gradually and maintain rumen health

Sudden access to large amounts of grain can cause ruminal acidosis, also called grain poisoning.

Use a planned introduction programme, adequate roughage and consistent feeding. Avoid an empty feeder followed by unrestricted access to a large refill. Changing grain type or moving to a more concentrated pellet may also require adaptation.

Watch individual lambs during induction. Those that hang back or fail to use the feeder need attention before substantial weight loss occurs.

If lambs become dull, stop eating or develop diarrhoea after a feed change, contact your vet promptly. Do not assume they simply need time to adjust.

Keep pasture management, stocking and terrain connected

Stock according to the feed supply and the needs of the lambs. High numbers per hectare are only productive while the pasture and infrastructure can support them.

Give finishing lambs access to feed that can sustain their target growth. Review walking distances, steep ground, muddy gateways and competition around water, particularly for newly weaned or vulnerable animals.

Manage grass seed hazards before seeds become a problem. Seeds can penetrate skin and other tissues, affect welfare and lead to trimming losses at processing.

Identify risky paddocks and plan grazing, pasture management and finishing dates accordingly.

Make water and shelter part of the feeding plan

Provide clean drinking water and inspect troughs regularly, particularly after moving lambs or during hot weather. Check that small lambs can reach the water and that refill rates cope with peak demand.

Clean troughs and repair leaks that create muddy approaches. Water quality needs investigation where salinity or contamination could limit intake.

Provide enough shade and shelter for the mob. Heat can reduce grazing and feeding, while cold rain and wind increase the challenge for young, thin or recently shorn lambs.

Move vulnerable groups to protected areas before severe weather arrives. Plan shearing around welfare, weather and management needs rather than assuming it will automatically improve growth.

In housed or feedlot systems, provide dry resting areas, drainage, appropriate space, good ventilation and adequate feed access. Inspect lambs daily and have a suitable recovery area for animals needing individual care.

Use an effective worm control programme

Worms can reduce growth before lambs look severely unwell.

Use a regional programme that combines worm egg counts, grazing management, appropriate treatments and checks that drenches remain effective. Young lambs and weaners need particular attention.

Do not rely on a fixed calendar or keep repeating a drench when performance remains poor. Review the diagnosis, dosing method, animal weights and possible resistance with your vet.

Nutrition supports resilience, but good feeding does not replace treatment when a clinically important worm burden is present.

Remember that scouring is not always worms

Coccidiosis can cause poor growth, diarrhoea and dehydration in young lambs, particularly where contamination and crowding increase exposure.

It requires a different diagnostic and treatment approach from ordinary gastrointestinal worms. A standard worm drench may not address it.

Your vet may assess age, signs, faecal samples, the species of coccidia present and post-mortem findings. Keep feed and water protected from faecal contamination and address wet, dirty areas.

Dietary upset and other infections can also cause diarrhoea, so persistent scouring needs investigation.

Prevent disease before changing production systems

Review vaccination before lambs enter a higher-risk feeding period. Enterotoxaemia, often called pulpy kidney, can cause sudden death in rapidly growing lambs.

Complete the required primary course and boosters according to the product label and your veterinary plan. Vaccination and careful dietary management work together.

For purchased lambs, review health declarations, treatments and disease history before mixing them with your flock. Plan quarantine and examinations for problems such as footrot, lice and other infectious conditions.

Maintain treatment records, including withholding periods and relevant export slaughter intervals, so health interventions do not compromise marketing decisions.

Healthy feet and skin protect feed intake

Investigate lameness promptly. Footrot, abscesses, injuries and joint infections need different management.

Provide affected lambs with easy access to feed and water, and use veterinary advice for pain relief and treatment. Avoid aggressive routine foot trimming. Research has shown that trimming feet affected by footrot can delay recovery.

Include flystrike prevention in the flock plan. Inspect lambs with dirty breeches, unusual rubbing or damp, smelly fleece promptly. Visible maggots or suspected flystrike require immediate attention, with urgent veterinary help for dull, weak or extensively affected animals.

Choose supplements carefully

Use mineral supplements to correct a demonstrated dietary need. The ration, pasture, water and local deficiency risks all matter.

Sheep are susceptible to copper poisoning, so cattle or goat feeds and mineral products may be unsuitable. Avoid combining products without checking their total contribution.

For grain-fed male lambs, mineral balance and water intake also matter because urinary stones can cause obstruction. Have the ration formulated appropriately rather than adding urinary acidifiers or minerals by guesswork.

For yeast products, probiotics or other additives, ask for evidence in comparable lambs and agree how you will measure any benefit. A supplement cannot correct inadequate feed access or untreated disease.

Use carcase feedback to improve the next mob

Compare liveweights, fat assessments and processor results. Review carcase weight, fatness, trimming losses, condemnations and any available eating quality feedback.

Dressing percentage varies, so a single conversion from liveweight to carcase weight will not fit every mob.

Slow-growing lambs may become relatively mature before reaching a heavy target, increasing the risk of costly fat gain. Separate these animals for assessment rather than automatically feeding them longer.

Carcase feedback can help determine whether the next change belongs in genetics, nutrition, health management or drafting for sale.

Protect welfare and quality during dispatch

Use calm handling, sound yards and loading facilities with secure footing. Plan transport around weather and only send animals fit for the intended journey.

Avoid unnecessary mixing and prolonged holding. Coordinate preparation, time off feed and access to water with the transporter and processor, following the requirements relevant to your consignment.

Research in prime lambs shows that stress before slaughter can affect carcase yield and meat quality. Careful handling protects both welfare and the product you have raised.

What does poor performance mean?

What you notice	Possible explanations	What to do
Slow growth across the mob, lambs otherwise bright	Inadequate feed quality or intake, stocking pressure, parasites	Review weights, feed and worm testing promptly.
A few lambs repeatedly fall behind	Competition, lameness, chronic disease or poor adaptation	Examine individuals and provide targeted management.
Diarrhoea, coughing, reduced appetite or a rise in deaths	Dietary disease, parasites or infection	Contact your vet the same day, urgently if severe.
A male lamb strains with little or no urine	Possible urinary obstruction	Seek immediate veterinary attention.
Collapse, severe bloating, breathing difficulty or sudden deaths	Potentially life-threatening disease	Contact your vet immediately.

When is this an emergency?

Do not delay help for a lamb that cannot stand, struggles to breathe, is severely bloated or appears collapsed.

A male lamb repeatedly straining without passing urine is an emergency, even if mistaken for constipation. Urinary obstruction can lead to bladder or urethral rupture.

Weak newborns unable to suck, severe flystrike and rapidly increasing deaths also need urgent attention. Keep affected animals safe and minimise stressful movement while help is arranged. Do not force oral drenches into animals that cannot swallow normally.

A practical improvement plan

1. Review the last lamb crop: identify losses between scanning, marking, weaning and sale.

2. Set the market target: agree weight, fat and quality requirements.

3. Build a feed and health plan: prepare for lambing, weaning, seasonal feed gaps and finishing.

4. Measure growth and intervene: investigate poor performers before they become a persistent tail of the mob.

5. Review the return: compare sale results with feed, labour, health costs and losses.

Electronic identification can connect weights, treatments and sale results. Reliable mob records also help. Assign someone to review the information and act on changes.

Common mistakes to avoid

• Focusing on scanning percentage while overlooking lamb survival.

• Leaving light weaners to compete with heavier lambs.

• Introducing grain abruptly.

• Treating all scouring as a worm problem.

• Holding finished lambs until the entire mob is ready.

• Buying supplements before checking feed, water, feet and disease.

What is the best weight to sell lambs?

Use the buyer’s carcase specification, the lambs’ fatness and your finishing costs. There is no single ideal liveweight for every breed and market.

Can lambs finish well on pasture alone?

Yes, when pasture quality, quantity and intake meet their requirements. Check actual growth and plan supplements or an alternative finishing strategy before feed becomes limiting.

Does grain feeding always improve profitability?

No. Compare the expected additional sale value with feed, labour, infrastructure, health costs and the risk of missing specifications.

Should every slow-growing lamb be drenched?

No. Worms are one possibility. Poor nutrition, coccidiosis, lameness, respiratory disease and competition can also reduce growth. Examination and appropriate testing guide treatment.

Start with the stage where the greatest avoidable loss occurs. Improving survival, maintaining growth or selling lambs at the right time can each make a meaningful difference when supported by good records and consistent care.

ASK A VET™ supports informed animal-health decisions. Bring your scanning results, lamb survival records, growth measurements, feeding plan and carcase feedback to a discussion with your sheep veterinarian so improvements address the needs of your flock.