Spotting Parasites In Chickens: What To Look For

how do you tell if a chicken has a parasite

Parasites in chickens are more common than you might think. They can wreak havoc on your flock, causing health issues and decreased productivity. The most common parasites found in chickens include worms, lice, mites, coccidia, cryptosporidium, and histomonads. Some parasites, like worms, can be spotted by checking droppings, while others, like lice and mites, can be identified by checking the feathers, skin, and vent area. Lice are straw-coloured and move quickly, while mites are tiny and can cause irritation and itching. If you suspect an infestation, it's important to seek treatment options, such as dewormers or poultry dust, and implement preventative measures to avoid reinfestation.

Characteristics Values
Lethargy Loss of energy, drooping appearance
Loss of appetite Stop eating
Diarrhea Loose droppings
Anaemia Fading in the red colour of the comb and wattles
Difficulty breathing Open beak, gasping for breath, stretching neck
Increased appetite
Weight loss
Stopped egg production Pale yolks
Dehydration
Irritation, itching or pain
Black debris around vent area
Clumped feathers around vent area
Pale colour
Lice eggs around vent area Whitish or straw-coloured clumps at the base of feathers
Louse Yellow, flat, 1-3mm long

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Symptoms of parasite infection

Parasites in chickens can cause a range of issues, from mild discomfort to more severe health problems. There are two main types of internal parasites in chickens: worms and protozoans. Worms are larger and can sometimes be seen with the naked eye, while protozoans are microscopic and require a microscope for detection.

One of the most common symptoms of a parasite infection in chickens is a change in their droppings. Chickens with parasites may have loose, watery, or diarrheal droppings, and in some cases, worms, worm eggs, or worm segments may be visible in the faeces. Infected chickens may also exhibit signs of weight loss, despite an increased appetite. They may appear lethargic, with drooping posture and a fading red colour in their combs and wattles, indicating anaemia.

In the case of a gapeworm infection, chickens will have open beaks, gasping for breath with stretched necks. Other types of worms, such as tapeworms and threadworms, can also infect chickens and may require specialised treatment.

Lice and mites are external parasites that can cause irritation, itching, and discomfort to chickens. Lice are larger and easier to spot, appearing straw-coloured and moving quickly when disturbed. They are often found around the vent area, under the wings, and at the base of feathers, where their eggs (nits) may be seen as white clumps. Mites are smaller and more challenging to eradicate, requiring treatment of both the birds and their environment, including nesting boxes and perches. Scaly leg mites, for example, cause lumpy, crusty skin on the feet and lower legs as they feed on the tissue underneath.

It is important to monitor chickens for any signs of parasite infection and provide necessary treatments to prevent further complications.

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Preventing parasite infestations

While it is difficult to completely avoid parasite infestations, there are several measures you can take to minimise the chances of a major parasite infestation in your chicken flock. Firstly, it is important to maintain the hygiene of the chicken coop, feeders, and waterers. Keeping the bedding dry and replacing wet and soiled bedding can help prevent parasite infestations. In addition, regular cleaning of the coop, removing all faeces and soiled bedding, is crucial to breaking the parasite lifecycle and reducing parasite loads.

It is also essential to prevent the development of wet, warm, and muddy areas in the chicken run, as these conditions are ideal for worm egg breeding. You can cover such areas with gravel, stone, or concrete to prevent the accumulation of worm eggs. Regularly rotating the ground by moving the chickens to different areas can also help to prevent a build-up of worm eggs in one location.

Ultraviolet (UV) light from the sun can naturally destroy worm eggs in short grass, so keeping the grass short in the foraging area can help control worm egg populations. Regular health checks and preventive measures are also recommended to maintain the health of your flock.

To prevent coccidiosis, an infection caused by the protozoan parasite coccidia, it is important to keep chickens hydrated, as dehydration is one of the causes of death from this disease. Additionally, using an antibiotic containing tylosin or amoxicillin can help prevent secondary infections.

For external parasites, such as mites and lice, preventing the access of wild birds to chicken enclosures can help limit infestations. New stock should be quarantined to avoid introducing parasites to the existing flock. Regular checks of the feathers, especially around the vent area, can help in the early identification of external parasites.

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Parasite treatment options

There are various treatment options available for parasites in chickens, including both drug-based and natural treatments. The treatment method depends on the type of parasite and the severity of the infestation.

Drug Dewormers

Drug dewormers are recommended for severe infestations. They are highly effective but should be used cautiously and only when necessary. Overuse of specific drug dewormers can cause parasites to develop resistance, rendering the treatment ineffective. Drug dewormers interfere with the parasites' ability to feed or paralyze them. They usually have a withdrawal period during which eggs and meat from treated chickens cannot be consumed. Piperazine and Hygromycin B are the only two drug dewormers approved for use on food animals.

Natural Dewormers

Natural dewormers can be fed to chickens to help eliminate internal parasites. Brassicas and Cucurbits, vegetables in the brassica and cucurbit family, contain sulfurous compounds that are repulsive to internal parasites. They also contain cucurbitine, which can paralyze worms if consumed in sufficient quantities. Garlic is another effective natural dewormer, containing sulfurous compounds dangerous to parasites. Allicin, a compound in garlic, breaks down into sulfide compounds that discourage parasites from proliferating. Garlic powder can be added to feed, or crushed fresh garlic can be added to water.

Commercial Mite Treatments

Commercial mite treatments can be used to treat northern fowl mites, which typically infest the vent area of chickens. It is important to follow the instructions and avoid the beak and eyes during application. The coop and nesting boxes should also be treated, and all chickens in the flock should be treated, even if only a few show signs of mites. Re-treatment is recommended after two weeks.

Pyrethrin-Based Treatments

Pyrethrin-based washes, sprays, and powders are generally safe and effective against external parasites in chickens, although they are not registered for use in poultry. A withdrawal period of 3-4 weeks should be applied.

Flurlaner (Exzolt®)

Flurlaner is an in-water medication that has shown high efficacy against all external parasites. It is used for one day and repeated after seven days. Retreatment is recommended every 3-6 months, and when combined with biosecurity measures to exclude wild birds, effective control can be achieved. As it is registered for use in poultry, it offers advantages over sprays and washes.

Battles Easyverm Parasite Pellets

Battles Easyverm Parasite Pellets are added to feed for one week per month. Herbal products can be used regularly, and if worms are still suspected, medical treatments such as Flubendazole can be administered. Flubendazole is the only licensed treatment for Roundworm.

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Diagnosing parasite infections

Firstly, it is important to note that there are two types of internal parasites in chickens: worms and protozoans. Worms are larger and can often be seen with the naked eye, whereas protozoans are microscopic and require a microscope to be seen.

One of the most common parasites found on chickens is lice. Lice are relatively easy to spot, as they move quickly in and around the feather shafts, and they are straw-coloured. They can be found at the base of a feather, and their eggs will be found in whitish clusters. The chicken body louse, Menacanthus stramineus, is usually 1-3mm in length, yellow, and flat. It has a lifecycle of around three weeks and is commonly found around the vent area and under the wings.

Mites are another common parasite in chickens, and they can be difficult to eradicate due to their small size and ability to survive in the coop, litter, and nest boxes. The chicken red mite is the most common chicken mite in Australia, measuring between 0.6mm and 1mm. Mites can cause irritation, itching, or pain at the affected site, and black debris and a build-up of mites may be observed around the vent area.

Worms are another common parasite in chickens, and they can be transmitted from chicken to chicken via egg-infested droppings. Chickens infected with worms may eat more than usual but lose weight or fail to gain weight. They may also exhibit lethargy, have loose droppings, and produce eggs with pale yolks. The worms may sometimes be expelled in the chicken's droppings, or worm eggs may be found. A faecal exam or a shop-bought kit can be used to diagnose worm infections.

Other parasites that can infect chickens include coccidia, cryptosporidium, histomonads, and tapeworms. Coccidiosis, caused by coccidia, can lead to dehydration, and cryptosporidium can cause cryptosporidiosis.

It is important to regularly check chickens for parasites and provide necessary treatments to prevent infestations and ensure the birds' health and well-being.

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Types of parasites

There are two types of internal parasites in chickens: worms and protozoans. Worms are larger and can often be seen with the naked eye, whereas protozoans are microscopic parasites that require a microscope to be seen.

Worms

Worms are common intestinal parasites in chickens. They can be transmitted from chicken to chicken via egg-infested droppings. The eggs can remain dormant on soiled ground for up to a year. Gapeworms and tapeworms are picked up via an intermediate host such as a slug, snail, or earthworm. Chickens infected with worms may exhibit the following symptoms:

  • Increased appetite
  • Weight loss or failure to gain weight
  • Pale egg yolks
  • Loose droppings
  • Anemia, recognised by lethargy, drooping appearance, and fading in the red colour of the comb and wattles
  • Bloody diarrhoea

Protozoans

Protozoans are single-celled organisms that can act as parasites. Coccidia, cryptosporidia, and histomonads are the most common protozoan parasites in chickens. They live and reproduce in the digestive tract, causing tissue damage, reduced nutrient and fluid absorption, diarrhoea, and blood loss. Coccidiosis, an infection caused by coccidia, can further increase a chicken's susceptibility to other diseases.

Mites

Mites are external parasites that can infest chickens. Northern Fowl Mite is passed from hen to hen, and infested birds will exhibit dirty-looking patches and depression.

Frequently asked questions

Some signs that your chicken may have worms include lethargy, weight loss, increased appetite, diarrhoea, and a decrease in egg production. You can also check your chicken's droppings for worms, or have a veterinarian perform a faecal exam.

If your chicken has worms, you can treat it with dewormers. There are two types of dewormers: drug dewormers and natural dewormers. Drug dewormers are more effective against severe infestations but must be used with caution as frequent use can cause parasites to develop resistance. Natural dewormers include garlic and vegetables in the brassica and cucurbit family, which contain compounds that are repulsive to worms.

Mites typically infest the vent area of a chicken, so you can check this area for irritation, itching, pain, or black debris and a buildup of mites. You can also check the feathers of the vent for lice, which are larger than mites and straw-coloured.

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