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Aries balanoposthitis
Balanoposthitis is the inflammation of the sheath and tip of the ram's penis. Breeders recognize it by a swollen, crusty, smelly sheath, with soiled and stuck hair around the orifice. Its origin is often surprising: it is first and foremost...
What is it?
Balanoposthitis is the inflammation of the sheath and tip of the ram's penis. Breeders recognize it by a swollen, crusty, smelly sheath, with soiled and stuck hair around the orifice.
Its origin is often surprising: it is first and foremost a dietary disease. A diet too rich in nitrogen, particularly protein concentrates or abundant legumes, increases the amount of urea eliminated in the urine. Bacteria normally present on the skin transform this urea into ammonia, a corrosive product, which literally burns the mucous membrane of the sheath with each urination.
The resulting ulcerations become infected, swell, crust over and attract flies. In advanced cases, the orifice narrows or closes with adhesions: the ram can no longer pull out his penis, it can no longer protrude, and he may no longer urinate normally.
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:
Sheath swollen, hot, with red, thickened skin around the orifice.
Brown or blackish crusts, ulcerations and cracks around the edge of the orifice of the sheath; the wool is stuck to it and soiled.
Strong and unpleasant odor, clearly perceptible when approaching the animal.
Pus or dirty fluid leaking from the opening.
The ram urinates drop by drop, in small quantities, while pushing; the urine wets the wool of the belly instead of flying out.
Animal that licks or bites its belly, tramples, lies down and gets up, isolates itself from the crowd.
Flies permanently attracted to the area, with risk of larvae appearing in the wounds during the hot season.
Refusal to protrude or ineffective protrusions: the penis remains blocked in the sheath because of adhesions.
In advanced forms, the sheath becomes a hard and deformed mass, and the animal is no longer able to empty its bladder, which constitutes an emergency.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The starting point is almost always a diet too rich in nitrogen compared to needs: protein concentrate distributed in abundance, alfalfa and other legumes as desired, extensive fattening, particularly when preparing animals for Eid or for sale.
Excess nitrogen is found in the form of urea in urine. Bacteria in the skin, particularly corynebacteria, break down this urea into ammonia, which irritates and ulcerates the mucous membrane of the sheath.
Humidity maintains everything: stagnant urine in wool, wet bedding, animals lying down in their droppings.
The ulcerated lesions then become superinfected by environmental bacteria, which explains the pus and the odor.
Long, unshorn wool around the sheath holds urine against the skin and considerably aggravates the phenomenon.
Other, more rare causes exist: viruses responsible for genital lesions, wounds, stinging plants, foreign bodies in the sheath.
Ration rich in proteins: concentrates distributed without limit, green legumes or hay as desired, intensive finishing before sale or before Eid.
Castrated rams, particularly sensitive because their orifice is narrower and the urine stagnates more.
Long, soiled wool around the sheath, unshorn animals.
Damp litter, poorly drained buildings, high density in sheepfolds.
Hot season, with high fly pressure.
Lack of clean water at will: concentrated urine is more aggressive.
Animals that lie down for a long time, fatty animals.
Transmission
The disease is not contagious in the classic sense: several animals in the same batch are affected because they receive the same ration and live in the same conditions, not because they contaminate each other.
Transmission between animals, however, remains possible during riding and through soiled equipment, and certain genital lesions of viral origin are actually transmitted upon contact.
An affected ram that breeds ewes can transmit surface germs to them and cause inflammation of the vulva in them.
The simultaneous presence of several affected animals must above all lead to a review of the ration and housing.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The examination requires turning the animal over or holding it correctly to see the sheath, which is never done spontaneously: many cases are discovered late for this reason alone.
The veterinarian assesses the extent of the ulcerations, looks for adhesions between the penis and the sheath, and above all checks that the animal can urinate.
A ram who can no longer urinate constitutes an absolute emergency: the bladder may rupture. The veterinarian must then also rule out obstruction of the urinary tract by stones, which is very common in rams and which gives similar signs.
It looks for fly larvae in wounds during the hot season.
An examination of the aptitude for breeding is useful before the fight: a ram whose penis can no longer emerge is unusable, even if it appears to be in great shape.
The veterinarian finally analyzes the batch's ration, because this is the real cause to be corrected.
Treatment
The first step is not a medication but a correction of the diet: reduce nitrogen intake, review the proportion of concentrate and legumes, ensure clean water as needed. Without this, no local treatment will last.
The wool around the sheath must be clipped and the area cleaned with a suitable antiseptic, prescribed by the veterinarian, in order to loosen the scabs and sanitize the wounds.
Regular local care is then applied to the ulcerations, associated as appropriate with antibiotic treatment and a general anti-inflammatory, on prescription.
Treatment against flies is essential in the hot season to avoid myiasis; if larvae are present, the veterinarian removes them and adapts the treatment.
When adhesions prevent the penis from exiting, or when the opening is narrowed to the point that it interferes with urination, surgery may be necessary. It must be carried out by the veterinarian, never improvised: the region is fragile and a brutal maneuver can permanently destroy the projection capacity.
A ram who no longer urinates must be seen urgently, whatever the time.
No irritant product, no household mixture, no burning of scabs should be applied to this area: these practices aggravate the lesions and create the adhesions that we seek to avoid.
Withdrawal periods for meat, especially in an animal intended for slaughter or Eid, must be requested from the veterinarian and strictly observed.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Balance the ration, particularly in fattening males and castrated males: the protein content must correspond to real needs, and not be pushed out of habit.
Give clean water as desired, which dilutes urine and reduces the aggressiveness of ammonia.
Shear the wool of the belly and sheath regularly, especially before summer and before wrestling.
Maintain dry and clean litter, mulch sufficiently, avoid overdensity.
Inspect the sheath of all rams during the check before the wrestling season, at the same time as palpating the bursae: this is the natural time to do it.
Fight against flies during the hot season.
Isolate and quickly treat the first affected animal, because its presence signals that the entire flock is exposed to the same conditions.
Particular suspicion during periods of rapid fattening before the holidays: this is when cases multiply.
Possible complications
Permanent impossibility of protruding by adhesions or by narrowing of the orifice, in an otherwise healthy ram.
Retention of urine, distension then rupture of the bladder: life-threatening emergency.
Myiasis, with larvae that burrow into tissues during the hot season.
Deep sheath infection and abscess.
Weight loss and loss of physical condition due to permanent pain.
Contamination of bred ewes, with inflammation of the vulva.
Carcass devalued at slaughter.
When to see a veterinarian
A ram urinates drop by drop, while pushing, or is no longer able to urinate: it is an emergency, call immediately.
The sheath is swollen, crusty, smelly, or leaking.
The ram licks its belly, stomps, lies down and gets up again and again.
Fly larvae are visible in the wounds.
The ram refuses to protrude or its protrusions remain ineffective.
Several males from the same batch have lesions of the sheath: have the ration reviewed with the veterinarian.
You are preparing an animal for sale or for Eid and it shows these signs: Do not treat it alone, a withdrawal period may apply.
Prognosis
Forms taken early, with a correction of the ration and regular local care, heal well and without after-effects.
Old forms, with adhesions or narrowing of the orifice, often permanently compromise the use of the ram as a breeder, even after surgery.
Complete urine retention puts the animal's life at stake within a few hours and requires immediate intervention.
At the batch level, as long as the ration is not reviewed, relapses and new cases are the rule.
Frequently asked questions
My ram's sheath is swollen and smells bad, is this contagious to others?
In the majority of cases no: the other animals in the group are mainly at risk of being affected because they eat the same ration and live in the same litter. It is therefore necessary to correct diet and housing, not just to treat the individual. However, some genital lesions are of contagious origin, hence the importance of veterinary advice.
Why am I told that it is diet that is to blame?
Because a diet too rich in nitrogen causes a lot of urea to be eliminated in the urine. Bacteria in the skin transform this urea into ammonia, a corrosive product that burns the mucous membrane of the sheath. Reducing excess protein and giving water as much as you want is the real fundamental treatment.
My ram looks in great shape but is no longer protruding, what's the connection?
Healing ulcerations create adhesions between the penis and the sheath, or narrow the opening. The animal can no longer extend its penis and becomes unusable while riding, while eating and behaving normally. This is why the sheath must be inspected before each wrestling season, at the same time as the testicles.
Can I clean and remove the scabs myself?
Clean gently, yes, with a product recommended by the veterinarian. Tearing off the scabs by force or applying an irritant product, no: this creates new wounds and promotes precisely the adhesions which make the ram unfit for mating. And if the animal no longer urinates, it is no longer a question of cleaning but of a veterinary emergency.
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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