Metabolic loris bone disease
Metabolic bone disease (MBD) of the loris is a nutritional disorder affecting the skeleton. It results from an imbalance in calcium, phosphorus or vitamin D. The bones become fragile and gradually deform. It is one of the most common condit...
What is it?
Metabolic bone disease (MBD) of the loris is a nutritional disorder affecting the skeleton. It results from an imbalance in calcium, phosphorus or vitamin D. The bones become fragile and gradually deform. It is one of the most common conditions among malnourished lorises held in captivity. The loris is a nocturnal primate native to Asia, particularly sensitive to this type of deficiency.
Key point
Serious illness if untreated: risk of multiple fractures, irreversible deformations and neurological complications that could threaten the life of the animal.
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 discreet: the animal moves less, seems stiff or hesitates to climb. \nOver time, lameness or deformation of the limbs and spine may appear. \nThe animal may present spontaneous fractures during ordinary movements, without apparent trauma. \nLoss of appetite, general depression and painful sensitivity to touch are often noted. \nIn advanced cases, tremors or an inability to stand may occur, especially if blood calcium levels drop sharply.
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 disease comes from a prolonged dietary imbalance: insufficient calcium intake, excess phosphorus, or lack of active vitamin D. \nIn lorises, a diet too rich in fruit and low in insects, gums or whole prey promotes this imbalance. \nA lack of exposure to suitable light (UV) in captivity also prevents the correct synthesis of vitamin D by the skin. \nThe body, to maintain a stable blood calcium level, then draws on bone reserves, which gradually weakens the skeleton.
Young growing lorises are particularly vulnerable because their mineral requirements are high. \nA diet consisting mainly of fruit, without supplements or varied prey, greatly increases the risk. \nThe absence of suitable UV lighting in captivity is a major aggravating factor. \n Pregnant or lactating females have increased needs and are therefore more exposed.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian uses the dietary history, clinical examination and palpation of the skeleton to detect pain or deformation. \nX-rays make it possible to visualize bone demineralization and possible fractures. \nA blood test can assess levels of calcium, phosphorus and other metabolic markers. \n This complete assessment helps guide treatment and rule out other causes of lameness or weakness.
Treatment
Management is primarily based on a gradual correction of the diet, under veterinary supervision, with appropriate calcium and vitamin D supplements. \nExposure to appropriate UV light is often recommended. \nIn painful cases, pain relief treatment may be prescribed. \nRest and limitation of physical activities are recommended during bone consolidation. \n No self-medication should be undertaken, as an excess of poorly dosed calcium can be as harmful as a deficiency.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Provide a varied and balanced diet, including insects, gums, whole prey and mineral supplements adapted to the species. \n Ensure appropriate UV lighting in captivity to allow the natural synthesis of vitamin D. \n Have the growth and body condition of the animal regularly monitored by a veterinarian specializing in exotic animals. \nAvoid any excess of sweet fruits to the detriment of a nutritionally complete ration.
Possible complications
Without treatment, fractures can multiply and consolidate poorly, leading to permanent deformities. \nA severe drop in blood calcium can cause tremors, seizures or paralysis. \nReduced mobility and chronic pain affect quality of life and can lead to general decline of the animal.
When to see a veterinarian
The animal limps or avoids climbing when it used to do so.\nDeformities of the limbs or back are visible.\nThe animal seems depressed, in pain or refuses to eat.\nTremoring or an inability to stand appears.\nA fracture is suspected after an ordinary movement.
Prognosis
The prognosis is favorable if the disease is detected early and the diet corrected quickly, with a gradual recovery of bone strength. \nOn the other hand, deformations already installed are often irreversible. \nA delay in treatment darkens the prognosis, particularly in the event of multiple fractures or neurological complications linked to a severe drop in blood calcium.
Frequently asked questions
Is metabolic bone disease curable?
Yes if it is detected early. Appropriate dietary correction often allows for gradual improvement, but the deformities already present generally do not disappear completely.
Can you give calcium alone as a supplement to your loris?
No, you should never supplement alone without veterinary advice. An excess or imbalance between calcium, phosphorus and vitamin D can worsen the situation rather than resolve it.
Why are captive lorises particularly concerned?
In captivity, the diet is often too rich in fruits and low in insects or whole prey, and exposure to natural UV rays is reduced, which promotes this nutritional imbalance.
How do I know if my loris is at risk?
An exotic animal veterinarian can evaluate the animal's food intake, lighting conditions and body condition to identify risk before symptoms appear.
References
WSAVA — World Small Animal Veterinary Association
Content reviewed by the TunisieVet editorial team · Updated 23 September 2026
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