Canker Trichomoniasis in Pigeons and Pet Birds
Canker, or trichomoniasis, is one of the best-known pigeon diseases among Egyptian fanciers and appears mainly during the racing season, when birds crowd together in crates and auctions. A protozoan parasite colonises the throat and crop and produces cheese-like yellow plaques that block swallowing and breathing. Young birds can die quickly, while adults may carry the parasite without obvious signs and pass it on through shared drinking water. Early examination and clean feeders are the key to control.
What canker is and how it spreads
Canker is caused by a parasite, not a bacterium or a virus, so ordinary antibiotics do nothing against it. It spreads from bird to bird through contaminated drinking water and damp feed, and when adults feed squabs with crop milk. Pigeons drinking from a shared basin in a crowded loft become infected quickly, and birds bought at a market without quarantine bring the parasite into the flock.
The parasite survives only a short time outside the bird, but moisture and warmth extend its life, which is why cases peak in summer. Feral pigeons and stray birds can be a hidden source of infection. Sharing equipment between crates and moving birds between fanciers without examination are major drivers of spread in dense neighbourhoods.
Signs and early warning clues
The first thing an owner notices is a bird that swallows with difficulty and yawns repeatedly, with mucus around the beak. Opening the beak reveals yellow or grey plaques on the roof of the mouth, the side of the tongue or in the crop, sometimes with a foul smell. The bird loses weight fast because pain stops it eating, and the feathers become fluffed and dull.
Advanced cases show laboured breathing with a whistling sound, watery droppings and sudden death in squabs before any sign appears. Crop involvement causes swelling and feed regurgitation. Canker must be distinguished from diphtheria and bacterial throat infection, because the treatment is completely different; diagnosis relies on throat examination and a swab under the microscope.
- Repeated beak opening and difficulty swallowing.
- Cheese-like yellow plaques in the throat or crop.
- Weight loss, fluffed feathers and lethargy.
- Mucus discharge and a foul smell from the beak.
- Sudden deaths among squabs in the nest.
Diagnosis and treatment under vet care
An avian vet diagnoses the case by examining the throat and reading a wet swab under the microscope for moving parasites. Treatment relies on antiprotozoal drugs such as metronidazole or carnidazole, dosed by the vet according to the bird weight and condition; guessing the dose is dangerous because an overdose can damage the nervous system. Very thin birds may need fluids and nutritional support before medication.
Gentian violet is traditionally used as a local dab on the plaques, but it does not replace systemic treatment and must not be applied at high concentration inside the mouth. Isolate the affected bird, disinfect drinkers daily and replace the water with a clean supply. Give vitamins and minerals to support appetite and weight after treatment, and repeat the examination after a week to confirm recovery.
Prevention inside the loft
Prevention starts with water: use drinkers that are easy to clean, empty them twice a day in summer and never leave stagnant water. Isolate new birds in a quarantine crate for two weeks and examine the throat before they join the flock. Clean the floor daily and remove droppings, and keep the loft dry because moisture protects the parasite.
Weigh the birds weekly and record any bird that loses weight or opens its beak repeatedly. During racing season the vet may advise a periodic preventive programme, but never give preventive drugs randomly, as resistance can develop. Equip the loft with clean drinkers from our bird supplies, support stock with poultry vitamins, and keep gentian violet for local use only under veterinary guidance.
Conclusion
Canker spreads fast but is controllable when the throat is checked early and water is cleaned daily. Do not rely on gentian violet alone or on a friend recommendation, because a wrong dose can kill the bird. Call an avian vet at the first sign and isolate the affected pigeon immediately to protect the rest of the loft.
This article is general guidance and is not a substitute for examining your animal by a licensed veterinarian. In emergencies, contact your vet immediately.
