Jake Harper
It is a well-known fact that chickens will eat almost anything, including mouldy bread. But does that mean it's good for them? The answer is no. While a small amount of mould may not always lead to health issues in chickens, it can still be deadly under the right conditions. Mouldy bread contains harmful toxins that can cause a range of conditions called mycoses, leading to respiratory and intestinal issues as lesions develop in various organs. Therefore, it is best to avoid giving chickens mouldy bread, even if it seems like a convenient way to reduce food waste.
| Characteristics | Values |
|---|---|
| Bread for chickens | Should be stale, not mouldy |
| Mouldy bread | Can contain harmful toxins |
| Impact on health | Respiratory and intestinal issues, food poisoning |
| Mycosis | A fungal infection that can be deadly |
| Mycosis factors | Overcrowding, low litter, long antibiotic therapies |
| Mouldy food | Should be discarded |
| Bread | Lacks essential nutrients |
| Mouldy bread ratio | 25% mouldy bread for a flock of 25 birds is okay |
| Mould spores | Can cause aspergillosis, a serious lung infection |
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What You'll Learn
The dangers of mouldy bread for chickens
While chickens can technically eat mouldy bread, it is not recommended. Mouldy bread can contain harmful toxins that can adversely affect a chicken's health. Although chickens can tolerate a certain amount of mould on their food, mould spores can be inhaled and cause aspergillosis, a serious and often fatal lung infection.
Chickens can get food poisoning, and mouldy bread may cause respiratory and intestinal issues as lesions develop in the lungs, air sacs, and other organs. This condition is known as mycoses, which can develop as an internal disease before any external symptoms are displayed. Mycoses are treatable, but early detection is important.
Some of the most common and dangerous types of mould produce mycotoxins, which can be devastating to the health of people and animals, especially chickens. These toxins can act as poisons or irritants, and certain strains of toxic mould can be fatal.
It is best to avoid giving chickens mouldy bread as it is not worth the risk to their health and wellness. While a small amount of mould may not always cause health problems, it is an unnecessary risk. If bread is fresh or slightly stale with a small patch of mould, it is generally safe to remove the mouldy portion and give the rest to the chickens. However, if the bread is covered in dark, green, blue, or brownish patches, it should be discarded rather than fed to chickens.
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The nutritional value of bread for chickens
While chickens can eat bread, it is not a nutritionally rich food for them and can cause health issues if fed in large quantities. Bread is high in carbohydrates and can fill up chickens without providing the essential nutrients they need, such as protein and calcium, which are necessary for egg production and quality.
Chickens require a balanced diet with a diverse range of foods to function properly. A healthy diet for chickens includes grains, vegetables, fruits, and proteins. Bread can be given to chickens in moderation as an occasional treat but should not be a primary food source. Whole grain or sprouted grain bread provides more nutritional value than white or processed bread.
To improve the nutritional value of bread for chickens, it can be moistened with water or broth and mixed with other healthy ingredients, such as grains, vegetables, or protein-rich treats. Additionally, stale or leftover bread can be used, but it is important to ensure there are no signs of mold, as this can be harmful or even deadly to chickens.
Moldy bread contains mycotoxins, which are dangerous to chickens and can cause a range of health issues, including respiratory and intestinal problems, reduced egg production, and, in severe cases, fatality or permanent paralysis. Therefore, it is crucial to avoid feeding moldy bread to chickens and provide them with a nutritious and balanced diet to ensure their well-being and optimal health.
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Mycoses and other chicken health issues caused by mouldy bread
While it is quite common to feed chickens leftover bread, mouldy bread should be avoided as it can cause health issues. Mouldy bread contains a particular type of toxin called mycotoxins, which are produced by fungi, including the mould that grows on food such as bread. The main risk of ingesting these toxins is a range of conditions called mycoses.
Mycoses are mostly non-contagious infectious diseases. Most birds are constantly exposed to fungi without any effect, because mycoses in birds are usually related to immunosuppression. Factors which may cause immunosuppression include stress. Therefore, despite pathogenic fungi being widespread in the environment, immunocompetent birds are generally resistant to the disease.
There is a wide variety of fungal infections in birds, with the most relevant in poultry farming being aspergillosis, candidiasis, and mucormycosis. Aspergillosis is caused by fungi of the genus Aspergillus, which is an opportunistic fungus present in the environment that can be present in the lungs and air sacs of the birds without any effect until immunosuppression triggers the disease. Respiratory mycoses are favoured by the avian respiratory system, as the bird's air sacs are an ideal environment for the growth of Aspergillus. Initial lesions occur in the lungs and air sacs, although they can expand to any other organ, either by direct contact or by the hematogenous route, and then cause a systemic disease. Acute aspergillosis usually affects young individuals that do not have a proper development of the immune system, characterised by variable morbidity and high mortality.
Candidiasis is an opportunistic mycotic disease of the digestive tract of various avian species, including chickens, turkeys, and quail, due to Candida spp (primarily Candida albicans). Candida spp are typically part of the commensal GI mycobiota of healthy poultry. Candidiasis results from disturbances of the normal microflora and is commonly found in unsanitary drinking facilities. Heavy parasitism and malnutrition (vitamin A deficiency) have also been implicated. Young chicks and poults are the most susceptible. Histopathologic features of candidiasis include epithelial hyperplasia, ballooning degeneration, and visualisation of pseudohyphae and blastospores consistent with Candida spp.
Feeding chickens mouldy bread is one of the easiest ways to give them mycoses. While a small amount of mouldy bread may not always lead to mycosis in chickens, and a lot of birds can go for years without developing such a fungal infection, it is still an unnecessary risk. The higher the amount of mouldy bread given to chickens, the higher the risk of problems.
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How to avoid chickens eating mouldy bread
While stale bread is generally considered an acceptable treat for chickens, it is important to avoid giving them mouldy bread. Mouldy bread can contain dangerous chemicals and toxins that can make chickens very sick, or even kill them. Chickens can get food poisoning, just like humans, so it is best to avoid giving them anything mouldy.
To avoid chickens eating mouldy bread, it is important to store bread properly. Bread should be kept in a cool, dry place, and preferably in an airtight container. If you are storing bread for chickens, it is best not to buy it months in advance, as this increases the risk of mould. You can also freeze bread to extend its shelf life, but be aware that condensation can form when frozen bread is left out, leading to mould growth.
If you notice any green, black, blue, or white spots on the bread, or if it starts to smell strange, such as like alcohol or vinegar, it should be thrown away, out of reach of chickens.
If you want to give your chickens bread, it is best to offer them fresh or slightly stale bread, and only in moderation, as bread does not contain all the nutrients they need. You can also make your own chicken bread, adding fruits and vegetables to increase the nutritional value.
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The types of mould that are toxic to chickens
While chickens can technically eat mouldy bread, it is not recommended. Mouldy bread may contain harmful toxins that can adversely affect a chicken's health. There are over a hundred thousand types of mould, and some are more dangerous than others. Many of the types of mould that grow on bread can also grow on other foods, so similar health risks apply.
Aflatoxins
These are highly toxic and carcinogenic mycotoxins produced by Aspergillus fungi. They are commonly associated with poultry feeds and ingredients, and chickens are extremely vulnerable to their effects. Aflatoxins cause immunosuppression, decreased food intake, sterility, anaemia, egg abnormalities, and even death. Pale combs and wattles, weight loss, lethargy, leg weakness, and abnormal egg-shell appearance are common symptoms of aflatoxin poisoning.
Ergot Poisoning
Ergot poisoning is associated with a mould called Claviceps, which attacks cereal grains, particularly rye, but also other grains like wheat, barley, rice, and sorghum. Ducks are especially vulnerable to ergot poisoning and usually die. Encrustations on the comb, wattles, face, eyelids, and legs are signs associated with ergot poisoning in chickens.
Fusarium Poisoning
This involves various toxins produced by Fusarium moulds, including trichothecenes, moniliformin, fumonisins, and fusarochromanone, which often appear alongside aflatoxins. These toxins are commonly found in contaminated litter, feed, soil, and plants. Ochratoxins, produced by Fusarium moulds, are particularly poisonous mycotoxins that infect grains, causing increased thirst, anaemia, leg weakness, and severe immunosuppression in chickens.
Citrinin
Citrinin is a natural contaminant of corn, rice, and other cereal grains, produced by Penicillium and Aspergillus fungi. It causes increased water consumption and gizzard blockages in chickens.
Mycoses
Mycoses refer to a range of conditions caused by ingesting mouldy food or exposure to mould in the chicken coop. It can lead to respiratory and intestinal issues as lesions develop in the lungs, air sacks, and other organs. Mycoses can be challenging to detect as they may develop internally before any external symptoms appear.
In general, it is best to avoid feeding mouldy bread or any mouldy food to chickens, as some moulds can be highly toxic and detrimental to their health.
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Frequently asked questions
No, chickens should not be fed moldy bread. It can make them very sick and even kill them. If there is a small patch of mold, it is best to break it off and feed the rest to the chickens.
Moldy bread contains harmful toxins that can adversely affect a chicken's health. It can cause respiratory and intestinal issues, and in some cases, lead to a fungal infection called mycosis.
Even a small amount of moldy bread can be harmful to chickens. If the bread is shot through with lots of dark, green, blue, or brownish patches, it should be discarded instead of fed to chickens.
Instead of moldy bread, chickens can be fed a healthy diet of grains, vegetables, and protein-rich treats. Stale bread that is not moldy can also be fed to chickens in moderation as an occasional treat.
