parasitic disease Lama, Alpaca

Llama gastrointestinal parasitism (roundworms)

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Definition Signs Causes Transmission Diagnosis Treatment Prevention Complications When to see a vet Prognosis FAQ Sources Affected species

What is it?

Gastrointestinal parasitism by roundworms (nematodes) is a very common disease in llamas. These small worms live in the animal's stomach and intestine, where they feed on blood or nutrients. They are present in almost all pasture-raised llamas, but only become a health problem when their numbers become too large. Young animals and weakened llamas are most susceptible to severe forms of the disease.

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:

Diarrhea Weight loss Loss of appetite Dull coat Reduction Dehydration Pale mucous membranes Edema Hard or painful abdomen

The signs vary depending on the number of worms present and the species concerned.\nIn light infestations, the animal often shows no visible symptoms.\nIn more severe forms, we observe progressive weight loss despite a preserved or reduced appetite, a dull and pitted coat, fatigue and a lack of dynamism.\nCertain llamas develop diarrhea, sometimes intermittent.\nWorms that feed on blood, such as Haemonchus, can cause anemia visible by the paleness of the mucous membranes (gums, eyelids) and sometimes a swelling under the jaw called "bottle jaw" (edema linked to the lack of proteins in the blood).\nIn severe cases, the animal can become very weak, lie down frequently and die without treatment.

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 is caused by several species of gastrointestinal nematodes, the most important of which in llamas are Haemonchus contortus, Trichostrongylus, Ostertagia and Nematodirus. These parasites, initially described in sheep and goats, have adapted to camelids in regions where the two types of livestock coexist. Llamas become infested by ingesting the larvae present on pasture grass contaminated by the droppings of carrying animals.

Grazing on plots overloaded with animals or insufficiently rested encourages the accumulation of larvae.\nSharing pastures with sheep or goats, which are very susceptible to Haemonchus, increases the risk of cross-contamination.\nHot and humid conditions favor the development and survival of larvae on the grass.\nYoung animals, females at the end of gestation or in lactation, and llamas weakened by another disease or insufficient nutrition are more vulnerable.\nSignificant stress, a change in environment or high breeding density can also aggravate the infestation.

Transmission

Transmission occurs by ingestion of infective larvae present on pasture grass contaminated by the excrement of carrier animals. There is no direct transmission between animals without passing through pasture.

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 clinical examination, the evaluation of the body condition and the color of the mucous membranes.\nA stool analysis (coproscopy) makes it possible to count the parasite eggs and identify the species involved.\nA blood test can be useful to assess the degree of anemia and the blood protein level, particularly in the event of suspected Haemonchus infestation.\nIn certain cases, the veterinarian may recommend an egg count reduction test after treatment to check the effectiveness of the product used and detect possible resistance.

Treatment

Treatment is based on the use of families of antiparasitics (wormers) adapted to the parasitic species identified, prescribed and dosed by the veterinarian.\nIn case of severe anemia, nutritional support or a blood transfusion may be necessary.\nPasture management must accompany any drug treatment to avoid rapid reinfestation.

Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.

Prevention

Prevention is based on good grazing management: avoiding overgrazing, alternating plots and letting the grass rest helps reduce the quantity of larvae ingested.\nRotation with species not susceptible to the same parasites, or alternating grazing with cattle, can help break the parasitic cycle.\nRegular monitoring of the body condition and the color of the mucous membranes makes it possible to identify animals at risk early.\nStool analyzes carried out periodically by the veterinarian allows antiparasitic treatments to be adapted only to animals that need them, which limits the development of resistance.\nMaintaining a good diet and avoiding excessive breeding density reinforces the natural resistance of llamas.

Possible complications

A massive untreated infestation can lead to severe anemia, general weakening, stunted growth in young, and in extreme cases death of the animal.\nChronic infestations also weaken the immune system, making the animal more susceptible to other diseases.

When to see a veterinarian

Progressive weight loss despite a normal or reduced appetite.

Persistent or recurrent diarrhea.

Paleness of the gums or mucous membranes.

Swelling under the jaw.

Marked depression or refusal to get up.

Dull, pitted coat associated with a decline in general shape.

Prognosis

The prognosis is generally good if the infestation is detected and treated early. In the event of severe anemia or delay in treatment, the prognosis becomes more guarded, particularly in young animals or already weakened llamas.

Frequently asked questions

Can llamas catch worms from sheep?

Yes. Several nematodes such as Haemonchus contortus, well known in sheep and goats, also infest llamas, especially when they share the same pastures.

Should we systematically deworm all the llamas in the herd?

No, it is preferable to have stool analyzes carried out by the veterinarian to only treat animals that are actually infested, which limits the development of resistance to antiparasitic drugs.

Can a llama without symptoms still be infested?

Yes, a light to moderate infestation can go unnoticed. This is why regular monitoring of body condition and periodic analyzes are useful, even without visible signs.

Is swelling under the jaw always caused by worms?

This sign, called bottle jaw, is suggestive of severe anemia linked to blood-sucking parasites, but other causes exist. Veterinary advice is necessary to confirm the origin.