Gibbon Metabolic Bone Disease
Metabolic bone disease (MBD) is a skeletal disorder that affects gibbons, especially young ones in captivity. It results from an imbalance between calcium, phosphorus and vitamin D in the body. Bones become fragile, deform or break more eas...
What is it?
Metabolic bone disease (MBD) is a skeletal disorder that affects gibbons, especially young ones in captivity. It results from an imbalance between calcium, phosphorus and vitamin D in the body. Bones become fragile, deform or break more easily. This disease is well known in arboreal primates that are inadequately fed or exposed to the sun.
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 first signs are often discreet: the animal moves less, seems stiff or hesitates to jump from one branch to another, which is nevertheless natural in the gibbon.
We may observe lameness, an abnormal gait, a reluctance to climb or move normally.
Deformities of the limbs or the spine may appear over time, as well as swelling in the joints or ribs.
In advanced cases, fractures can occur even during ordinary movements, without violent shock. apparent.
The animal may also show a loss of appetite, general fatigue and, in young animals, stunted growth.
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 main cause is a dietary imbalance, in particular a lack of calcium, an excess of phosphorus, or a deficiency of active vitamin D.
In the gibbon, insufficient exposure to natural ultraviolet rays (UVB) prevents the skin from producing the vitamin D necessary for the absorption of calcium.
A diet too rich in sweet fruits or unbalanced, common in captivity, aggravates this mineral imbalance.
Young, growing animals are the most vulnerable, because their calcium requirements are high.
Indoor housing with little natural light or unsuitable artificial lighting increases the risk.
An poorly balanced diet, low in calcium or too rich in phosphorus, is a major factor.
Captive gibbons are more exposed than wild animals, due to their controlled environment.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian relies on the animal's dietary history and living conditions, as well as a clinical examination of the skeleton.
X-rays can assess bone density and look for fractures or deformities.
Blood tests can measure calcium, phosphorus and vitamin D levels to confirm the imbalance.
Treatment
Correcting the diet is the basis of treatment, with a rebalancing of calcium, phosphorus and vitamin D intake.
Mineral and vitamin supplementation can be implemented under veterinary supervision.
Controlled exposure to UVB light may be recommended.
In cases of fractures, orthopedic or surgical treatment may be necessary.
Rest and environmental design limit the risk of falls or new injuries during recovery.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
A balanced diet, designed with a veterinarian or a nutritionist specializing in primates, is essential.
Access to sufficient natural light or suitable UVB lighting promotes the synthesis of vitamin D.
Supplementation of calcium and vitamin D may be recommended by the veterinarian according to the animal's needs.
Regular checks make it possible to identify an imbalance before the appearance of visible symptoms.
Possible complications
If left untreated, the disease can lead to repeated fractures, permanent skeletal deformities and reduced mobility.
In young animals, lasting growth retardation is possible.
In severe cases, chronic pain and immobility affect the general well-being of the animal.
When to see a veterinarian
The animal limps or hesitates to climb even though it normally did so before.
A deformity of a limb or spine is visible.
The animal appears painful, less active or refuses to move.
A fracture is suspected after a harmless movement.
A young gibbon has growth retardation or abnormal musculoskeletal development.
Prognosis
The prognosis is favorable if the disease is detected early and the dietary imbalance is corrected quickly.
In the event of established bone deformities or multiple fractures, permanent after-effects may persist despite treatment.
Regular veterinary monitoring clearly improves the chances of complete recovery.
Frequently asked questions
Does metabolic bone disease only affect young gibbons?
It is more common in growing young people, whose calcium needs are high, but it can also affect adults who are poorly nourished or have little exposure to natural light.
Is a gibbon fed only fruit at risk?
Yes, a diet too rich in sweet fruits and low in calcium promotes a mineral imbalance that can lead to this disease.
Is the disease reversible?
If it is taken care of early, dietary correction and veterinary monitoring often allow for good recovery. Advanced cases with deformities can leave after-effects.
Does an indoor gibbon really need UVB light?
Yes, natural or artificial UVB light is necessary for the skin to produce vitamin D, which is essential for calcium absorption.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
Content reviewed by the TunisieVet editorial team · Updated 30 October 2026
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