Claire Thompson
There are many reasons why a chicken may have died on its nest. Some of the most common causes of sudden death in chickens include egg-binding, heart attack, heart failure, and injury. Other causes include poisoning, disease, obesity, and predation. In some cases, the chicken may have died from a freak accident or organ failure. To determine the cause of death, a necropsy (autopsy) can be performed, and common parasites to look out for include worms, mites, and lice.
| Characteristics | Values |
|---|---|
| Cause of death | Heart failure, heart attack, trampling, internal injury, poisoning, disease, parasites, infection, obesity, calcium deficiency, calcium excess, old age, accident, organ failure, overheating, exposure to cold, egg-binding, stuck egg, yolk/egg white discharge |
| Symptoms/Signs | No signs of distress, laboured breathing, gasping for air, convulsions, extreme wing-flapping, lethargy, refusal to eat, excessive drinking, fatigue, bruising, abnormal vent feeling, poop stuck to feathers, diarrhea, maggots, full crop, sour crop, pendulous crop |
| Prevention/Treatment | Necropsy, autopsy, clean and spacious coop, nutritious feed, clean water, grit, access to free-range acreage, vaccination, early butchering of broiler birds, maintaining weight |
| Post-death Actions | Remove dead bird from coop, wear gloves, wash hands after handling, dispose of body, rake and dispose of contaminated bedding, dump and sanitize feeder and waterer |
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Infection, disease, or parasites
While it is impossible to determine the exact cause of death without a necropsy, there are several infectious diseases, parasites, and other health issues that are known to affect chickens.
Infectious Diseases
Avian encephalomyelitis, coccidiosis, and fowlpox are common infectious diseases in chickens. Avian encephalomyelitis primarily affects chicks and can be transmitted from parent to offspring. Fowlpox causes crusty and nodular lesions on the unfeathered portions of the bird, and occasionally in the mouth and trachea, causing death by suffocation.
Parasites
Common parasites in chickens include mites, lice, ticks, worms, and protozoa. The northern fowl mite and red mite are the most common types of mites, with the former being passed from hen to hen and the latter being carried by wild birds. Gapeworms live in the trachea of birds and are coughed up and excreted to infect other chickens. They cause snicking or gasping and can be fatal if untreated. Roundworms live in the small intestine and can cause severe weight loss. Histomonas is a protozoa that affects the liver in turkeys, pheasants, and other birds, causing bright yellow diarrhea, and is known as blackhead.
Other Health Issues
Chickens can also die from non-infectious causes such as obesity, calcium deficiency or excess, egg-binding, and heart failure. Obesity can lead to a myriad of health problems in chickens, similar to humans. Calcium deficiency can cause egg-binding, while excess calcium can lead to a fatal calcium buildup, especially in male chickens. Egg-binding can also be caused by excess weight and a lack of nesting space, resulting in a stuck egg. Heart failure is the most common cause of sudden death in chickens, especially in male chickens.
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Poisoning
Some other common poisons include:
- Ethylene glycol: Found in antifreeze, transmission fluids, and solvents. Free-ranging chickens can accidentally ingest this.
- Gossypol: Found in cottonseed meal, which is fed to laying hens.
- Rat and ant poisons: These may contain arsenic, which is toxic to chickens.
- Rodenticides: These can contain zinc phosphide or aluminium phosphide, which liberate phosphine gas upon ingestion. Phosphine gas is highly toxic to animals and humans.
- Lead: From old paint, lead shot, or fishermen's lead weights.
- Zinc: From ingestion of galvanised wire or old galvanised drinkers.
- Mercury: Used for treating grain; exposures are cumulative.
- Organophosphorous compounds: These are cumulative and result in regurgitation, muscle twitching, and death. Examples include diazinon, dichlorvos, and malathion.
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Obesity
Chickens, like humans, gain weight when they consume more calories than they expend. A typical hen should eat about 120-140g of pellets or mash per day. However, treats, snacks, and table scraps can disrupt their balanced diet and lead to obesity. Free-range chickens are less likely to be obese as they have more opportunities for exercise. Lack of exercise, coupled with a diet high in calories and fat, can result in excessive weight gain in chickens.
Additionally, obese chickens are more susceptible to heat stroke, especially in hot weather. Chickens rely on their respiratory systems to cool down, but abdominal fat can limit their breathing, making it difficult for them to regulate their body temperature. This can lead to heat stroke and sudden death.
To prevent obesity in chickens, it is important to provide a balanced diet, limit treats, and ensure they get enough exercise. By making these simple modifications, chicken owners can help their pets maintain a healthy weight and reduce the risk of obesity-related health issues and premature death.
In summary, obesity in chickens is a serious issue that can lead to Fatty Liver Hemorrhagic Syndrome, heat stroke, and other health complications. By providing a balanced diet, limiting treats, and promoting exercise, chicken owners can help their pets maintain a healthy weight and improve their overall health and longevity.
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Heart problems
Chickens with an unnaturally fast growth rate and excessively large body mass relative to the size of their organs, specifically their respiratory system and heart, are more prone to heart failure. This condition occurs when the chicken's heart can no longer pump the required amount of blood in each heartbeat, leading to breathing difficulties and reduced exercise tolerance. Right-sided heart failure can lead to ascites and a buildup of excess fluid in the abdomen or an increase in liver size.
Certain breeds of chickens are genetically predisposed to heart attacks due to microscopic lesions in their heart muscles. Additionally, factors such as stress, diet, and weight can contribute to heart problems in chickens. Overweight chickens are more likely to suffer from various health issues, similar to humans. A healthy diet and regular exercise can help reduce the risk of heart-related issues in pet chickens.
While good biosecurity, diet, and housing can reduce the risk of heart problems in chickens, some cases may still occur unexpectedly, even with excellent care. In some instances, chickens may show no obvious signs of distress before succumbing to a heart attack or heart failure. Therefore, it is essential to provide the best possible care and living conditions for your chickens to mitigate potential health risks.
To determine the exact cause of death in your chicken, a necropsy (the poultry version of an autopsy) is recommended. This can help identify any underlying heart conditions or other factors that may have contributed to the chicken's sudden death.
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Egg binding
Young hens and older layers are more susceptible to egg binding due to their reproductive systems still adjusting or aging. Additionally, genetics play a role, with certain breeds known for high egg production being more prone to the condition. Obesity is another risk factor, as excess fat can interfere with the smooth passage of eggs.
To address egg binding, immediate veterinary attention is crucial. Initial treatments include hydrating the hen, administering calcium intravenously, and providing vitamins and electrolytes in the drinking water. Applying lubrication to the cloaca can aid in easing the passage of the egg. If the hen fails to pass the egg within a certain timeframe, manual removal may be necessary, although this carries risks.
Preventative measures include providing a well-balanced diet with an appropriate calcium-to-phosphorus ratio, encouraging regular exercise, and being aware of breed characteristics and potential predispositions.
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