Metabolic Bone Disease in Asian Elephants

What is it?

Metabolic bone disease is a disorder affecting bone strength. It occurs mainly in young Asian elephants in captivity. The bones become fragile because they lack essential minerals, particularly calcium and phosphorus, or because the balance between these minerals is disrupted. This bone fragility can lead to deformities, fractures, and significant difficulty with movement. It is a disease that develops slowly, often over several months, making it hard to detect early on.

Commonly observed signs

These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.

Causes and risk factors

The main cause is prolonged nutritional imbalance. This can involve a lack of calcium or phosphorus in the diet, an improper ratio between these two minerals, or a lack of vitamin D, which helps the body absorb these minerals.

This imbalance is more common in captive elephants receiving an unvaried diet or lacking exposure to natural sunlight, which plays a role in vitamin D production by the skin. Lack of physical exercise can also contribute to weakening the bones, as can very rapid growth in young animals.

Young, growing elephants are the most vulnerable, as their mineral requirements are higher. Elephants raised in captivity with inadequate or poorly varied diets are at greater risk. Limited space for free movement and low sun exposure also increase risk. Elephants weaned early from their mother or fed poorly formulated milk replacers may also be more at risk.

Diagnosis and care

Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.

Treatment

Management focuses above all on correcting the diet, with rebalancing of mineral and vitamin intake under specialized veterinary and nutritional supervision. Mineral and vitamin supplements may be prescribed.

An appropriate exercise program is often implemented to gradually strengthen bones without risking fracture. In some cases, pain management is necessary. Any fractures require case-by-case evaluation, as surgery is complex in this species due to its size.

Prevention

Possible complications

Possible complications include fractures, permanent deformities of the limbs or spine, chronic lameness, and loss of mobility that can affect the animal's overall welfare. In severe cases, the disease can durably compromise the elephant's ability to move normally.

When to see a veterinarian

Prognosis

The outlook depends on the stage at which the disease is identified. If caught early and the diet is corrected promptly, the course can be favourable, especially in young animals whose bones are still developing. Conversely, if the disease is diagnosed late, bone deformities or fragility may persist despite treatment.

Frequently asked questions

References

WOAH — Organisation mondiale de la santé animale (ex-OIE)

AVMA — American Veterinary Medical Association

Content reviewed by the TunisieVet editorial team · Updated 30 August 2026