Why weaning timing matters

Industry research often points to 12 weeks as an optimum weaning age, but practical flock decisions should also take account of ewe condition, grass availability, lamb growth, and overall farm system.

If ewes are lean, grass supply is tight, or lamb performance is starting to slip, earlier weaning may be beneficial. Competition for grazing can affect both ewe recovery and lamb growth, so the goal should not only be to finish lambs well, but also to ensure ewes are in the right condition for mating.

When should lambs be weaned?

Weaning should take into account two main factors: the development of the lamb’s rumen and the lamb’s ability to convert feed efficiently into growth.

A lamb’s rumen is developed by around four weeks of age, but removing milk too early can reduce growth because milk remains a highly nutritious part of the diet.

By around 12 weeks, milk generally makes up a much smaller part of the lamb’s intake, although it still contributes valuable nutrition. At this stage, lambs need access to high-quality grass or feed to replace the declining milk supply.

Stocking rate, grass availability, and breed type should also guide decisions. For example, hill ewes may benefit from earlier weaning where grass quality falls away quickly.

Body condition score at weaning

Weaning is an important point to assess ewe body condition and make any necessary changes before tupping. Ewe condition has a strong influence on conception rates and next season’s lamb crop.

Both over-fat and under-conditioned ewes can underperform, so body condition scoring at weaning is essential.

• Group ewes into thin, fit, and fat categories
• Move thin ewes onto better-quality grazing or forage
• Use poorer grazing for over-fat ewes where appropriate
• Allow enough time to improve condition before mating

As a guide, it can take six to eight weeks on good grazing to gain one full body condition score.

Target body condition scores for tupping

• Hill ewes: 2.5
• Lowland ewes: 3.5

Investigate thin ewes

If some ewes are falling short on condition, it is worth investigating why. Weaning is a good opportunity to look more closely at underlying health or parasite issues.

• Carry out faecal egg counts to assess worm burden
• Consider liver fluke where relevant
• Review risks from Johne’s or Maedi Visna
• Discuss findings with your vet and agree an action plan

Vaccinations and treatments at weaning

Weaning is also a useful point for preventative treatments and health checks across the flock.

• Vaccinate against clostridial diseases and Pasteurella if not already completed
• Give first dose before weaning and follow up with the second dose as recommended
• Administer trace element supplements where needed
• Reserve aftermath grazing for weaned lambs where possible
• Carry out faecal egg counts and only worm lambs if needed
• Dose accurately to the weight of the heaviest lambs in the group

Weaning also gives you the opportunity to check each ewe’s teeth, teats, and feet, and identify any problem animals for culling decisions.

How Herdwatch can help

Herdwatch helps farmers keep detailed records of flock performance, including lambing data, treatments, breeding history, and animal health notes. Having this information in one place makes flock management faster and more efficient.

Track ewe and lamb performance

Monitor key information such as weights, breeding details, and performance records so you can identify problems early and act quickly.

Keep treatment records organised

Record medicines, vaccinations, and health interventions against individual animals or groups, helping improve traceability and compliance.

Support better flock decisions

With clearer records at your fingertips, it becomes easier to spot trends, assess ewe condition, and make informed feeding, treatment, and culling decisions.

Make weaning work for your flock

Weaning is a key management stage that affects both immediate lamb performance and future ewe fertility. By combining good timing, body condition scoring, health checks, and strong record keeping, farmers can improve flock productivity and prepare ewes for the next breeding cycle.