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Wool break
Shedding wool is not a skin disease: it is a trace. Wool grows continuously, and anything that hits the body—illness, fever, malnutrition, violent stress—slows or briefly interrupts this growth. The fiber thins at this precise moment, then...
What is it?
Shedding wool is not a skin disease: it is a trace. Wool grows continuously, and anything that hits the body—illness, fever, malnutrition, violent stress—slows or briefly interrupts this growth. The fiber thins at this precise moment, then returns to its normal thickness once the episode has passed.
There then remains, somewhere along the wick, a point of weakness. A few weeks later, the traction of friction, rain or shearing causes the fiber to give way at this exact location: the fleece separates in one piece, often over the entire animal, always at the same level.
This is what makes the phenomenon so useful to the breeder: wool is a record. The height of the break roughly indicates when the event occurred, and the fact that it affects all the animals in the herd at the same time says that it is a collective event — a period of scarcity, an illness that has passed through the herd, a heat stroke, a lack of water.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
The fleece separates in one go, into large sections, revealing clean, supple skin, without redness or crusting.
By gently pulling on a wick, it breaks sharply, always at the same height; You can feel a shrinkage of the fiber at this point on your finger.
The break is located at the same level throughout the animal's body, and often at the same level in all the animals in the group: it is the signature of a dated and collective event.
Animals do not scratch or rub themselves: they are indifferent to what happens to them. This is the point that separates this situation from scabies, lice or ringworm.
The remaining wool is dull, dry, springless, and tears easily.
Depending on the cause, we find other signs in the background: weight loss, fatigue, drop in consumption at the trough throughout the flock, ewes in poor condition after lambing.
Uncovered skin, suddenly exposed to the sun or the cold, can then turn red or peel: this is a consequence, not the cause.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
A bout of fever or general illness — respiratory infection, abortive disease, heavy parasitic infestation, mastitis, any condition that puts the animal down for a few days.
Marked undernutrition: lean period, drought, poor quality fodder, insufficient ration at the end of gestation.
A lack of water or interrupted access to water, which quickly weighs on the body.
The end of gestation and the beginning of lactation, periods when the ewe draws on its reserves: this is the most common cause, and the breakage often appears a few weeks after lambing.
A deficiency, particularly in proteins, minerals or trace elements, over a long period.
Intense stress: heatstroke, long transport, sudden change in diet, prolonged fasting, repeated handling.
Certain toxic plants and certain poisonings, as well as photosensitization, which damages the skin and causes wool to fall from exposed areas.
In all cases, the mechanism is the same: the organism has prioritized its survival and put the production of wool on hold.
Ewes at the end of gestation, carrying several lambs, and ewes in early lactation.
Periods of drought and lean times, years when fodder is lacking or deteriorates.
Herds poorly supplemented with minerals and trace elements.
Extreme heat without shade or sufficient watering.
Uncontrolled internal parasitism, which silently wears down the animal for weeks.
Infectious episodes having passed through the herd, even if they went unnoticed.
Long transports, sudden changes in diet, poorly prepared transhumance.
Young, old or already thin animals, which have fewer reserves to cope.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The role of the veterinarian here is not to treat the wool: it is to find out what happened. Wool shedding is a symptom, not a diagnosis.
It starts by ruling out skin diseases, which is generally quick: absence of itching, scabs and lesions, healthy skin under the fleece. If in doubt, scraping the skin or taking hair removes the ambiguity with scabies, lice or ringworm.
He examines the height of the break on the wick to estimate when the event occurred, and checks if all the animals in the batch are broken at the same level.
He then reconstructs the history of the last few weeks with the breeder: lambing dates, changes in ration, episodes of drought, water cuts, diseases observed, transport, treatments.
Analyzes can be offered: blood test for general condition and deficiencies, analysis of droppings for internal parasitism, examination of the most affected animals.
Finally, he evaluates the body condition of the entire herd, often more revealing than a single animal examined in detail.
Treatment
There is no treatment for wool that is already broken: the fiber is damaged, the year's fleece is lost, and nothing will repair it.
All the effort is on the cause. Depending on what the veterinarian identifies: correction of the ration and watering, provision of proteins, minerals and trace elements, treatment of internal parasitism, management of an infectious disease, provision of shade and shelter.
The correction must be gradual when it comes to feeding: a sudden change of ration in weakened animals creates other problems, particularly digestive ones.
Animals whose skin is exposed need to be protected: shade and shelter from the sun to avoid sunburn on unaccustomed skin, and shelter from the cold and rain if the weather is bad. A sheep that is brutally skinned in the middle of winter is cold, and it uses its energy to keep warm instead of feeding its lamb.
If the wool hangs in tatters, clean shearing carried out in good conditions is better than letting it tear off and become soiled: it limits friction, wounds and the attraction of flies. This decision is made according to the season and the condition of the animals.
Closely monitor bare areas during the hot season: exposed, soiled skin attracts flies and can lead to myiasis.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Securing food during critical periods, particularly at the end of gestation and the beginning of lactation: this is where most wool loss occurs.
Ensure permanent access to clean and sufficient water, and regularly check the water troughs: a break of a few days leaves a mark on the entire fleece of the flock.
Supplement with minerals and trace elements according to the veterinarian's advice, based on the actual ration.
Control internal parasitism, which wears out animals without anything being seen.
Provide shade and shelter during extreme heat.
Avoid sudden changes in ration, prolonged fasting and poorly prepared transports.
Monitor the body condition of the flock regularly, by hand: a loss of condition can be spotted well before it marks the wool.
Look at the strands when shearing: the presence of old breaks tells of the past year and allows you to correct them for the next one.
Possible complications
Total loss of value of the year's fleece, the wool tearing instead of shearing cleanly.
Sunburn and burns on severely exposed skin, especially in light-skinned animals.
Chilling and loss of condition in animals skinned in cold or wet weather, with direct consequences on milk production and lamb growth.
Wounds, dirt and attraction of flies to bare areas during the hot season, with risk of myiasis.
Growth retardation and weight loss if the underlying cause — deficiency, parasitism, disease — is not corrected.
Recurrence the following year at the same time if the management of the herd has not changed.
When to see a veterinarian
The fleece comes off in large sections on one or more animals, without them scratching.
The strands break cleanly at the same height in all animals in a batch.
Some ewes lose their wool in the weeks following lambing.
The animals lose weight, are tired or eat less.
You don't know if the skin is healthy or if there are scabs: have it examined, a contagious skin disease is treated quite differently.
Large areas of skin are exposed in the heat or in the cold: ask for advice on how to protect the animals.
The phenomenon repeats itself every year at the same time: it is a herd management problem, it must be addressed with the veterinarian.
Prognosis
For the animal, the prognosis is good: the wool grows back normally once the cause is corrected, and the skin has no after-effects.
The year's fleece, on the other hand, is definitively lost: it is a dry economic loss, which cannot be made up for.
Regrowth takes several months and the animal remains vulnerable to sun and cold in the meantime.
The real prognosis is that of the cause: a corrected deficiency or controlled parasitism is resolved well; unchanged breeding management will reproduce the same phenomenon at the same time the following year.
Frequently asked questions
My ewe loses all its wool but does not scratch itself, is it scabies?
Probably not. In mange, animals rub violently and the skin becomes crusted, red and broken. Here, the fleece goes away on its own, the skin underneath is clean and the animal remains indifferent. This is a sign of fiber breakage, caused by a past event: illness, undernutrition, difficult lambing. The vet quickly confirms and looks for the real cause.
How do I know when the problem occurred?
By looking at how high the wick breaks. The closer the break is to the skin, the more recent the event. If all the animals in the group break at the same level, it is because they experienced the same thing at the same time: look for food, water, heat or an illness that passed through the herd.
Will the wool grow back?
Yes, wool grows back normally as soon as the cause is corrected. It is the year's fleece that is lost, not the animal's ability to produce it. In the meantime, protect bare animals from the sun and cold, and watch for exposed areas of skin during the hot season due to flies.
This happens every year after lambing, is this normal?
It's common, but it's not normal and it's not inevitable. This means that ewes draw too much from their reserves at the end of gestation and at the start of lactation. Review the ration for this period with the veterinarian, as well as watering, mineral supplementation and control of internal parasites.
References
FAO — Organisation des Nations unies pour l'alimentation et l'agriculture
Content reviewed by the TunisieVet editorial team · Updated 11 August 2026
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