Jake Harper
A chicken may lay a rough-feeling egg due to a variety of factors, including age, diet, stress, and disease. For example, a calcium deficiency can cause thin or soft shells, while too much calcium can make shells overly thick or rough. Heat stress can also be a factor, as chickens' natural body temperature is higher than humans', and they lack effective cooling mechanisms. Additionally, respiratory diseases can cause thin or missing shells, and rough shells may indicate a phosphorus deficiency. Other factors include vitamin deficiencies, genetics, and environmental changes. While most abnormal eggs are safe to eat, it is important to address any underlying issues affecting the hen's health and well-being.
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What You'll Learn
Calcium deficiency
Calcium is an essential nutrient for hens to lay well and stay healthy. An eggshell is made of approximately 90% to 95% calcium. This means that hens need plenty of calcium in their diet to lay strong, healthy eggs. Calcium is also needed throughout a hen's body for various functions, such as controlling muscle spasms, triggering hormone production for a healthy reproductive system, and helping eggs hatch into healthy chicks.
A calcium deficiency can lead to a stop in egg-laying, and a hen's bones may become fragile, weak, and break easily. It also weakens the hen's immune system, making her more susceptible to disease. Calcium deficiencies are more common than an excess of calcium in a hen's diet. However, too much calcium can make eggshells overly thick, leading to rough-feeling shells.
Rough eggshells can be caused by calcium deposits, which occur when there is too much calcium in a hen's diet. These deposits can cause the eggshell to feel like rough sandpaper, with bumps or pimples on the shell. The severity of the roughness depends on the amount of foreign material present during the calcification process.
To prevent or resolve calcium deficiency, it is important to provide supplemental calcium in an easily accessible spot. Crushed oyster shells mixed with crushed eggshells or black soldier fly grubs are good sources of calcium. Switching to a high-quality complete layer feed can also help ensure hens are getting enough calcium, phosphorus, and vitamin D.
In addition to calcium deficiency, other factors that can contribute to rough eggshells include environmental stress, age, disease, and improper nutrition. Heat stress, in particular, can affect egg-laying ability and the quality of eggshells.
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Vitamin D deficiency
A chicken's diet must include vitamin D, calcium, and phosphorus for the chicken to remain healthy and lay eggs with strong shells. Vitamin D is necessary for the absorption and utilisation of calcium and phosphorus by the chicken's body. A deficiency in any of these nutrients can lead to a deficiency in the others.
Vitamin D3 is required for the normal absorption and metabolism of calcium and phosphorus. A deficiency can result in rickets in young growing chickens or osteoporosis and/or poor eggshell quality in laying hens, even if there are adequate levels of calcium and phosphorus in the diet. Laying hens fed a vitamin D3-deficient diet show a loss of egg production within 2–3 weeks, and shell quality deteriorates almost instantly.
In chicks, a vitamin D3 deficiency can cause stunted growth and growth abnormalities, like rickets, malformed bones or beaks, and severe leg weakness. Their beaks and claws become soft and pliable, and they may have trouble walking. In laying hens, a vitamin D deficiency can cause a decrease in laying or poor egg quality, resulting in thin or soft-shelled eggs. In severe cases of vitamin D deficiency, a hen's bones will feel soft and have a greater chance of breaking.
The best way to treat a hen for a vitamin D3 and calcium deficiency is to increase her vitamin D intake. This can be done by giving supplements such as Agrivite Feather Shell and Bone or, in severe cases, Zolcal-D, a liquid calcium and vitamin D veterinary support. Ensuring calcium sources are available alongside their normal pellet feed is also recommended.
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Stress and fright
Chickens are sensitive creatures, and stress or changes in their environment can affect egg quality. Stress can be caused by fright, excitement, excessive heat, or even something as simple as a change in their daily routine. For example, loud noises, overcrowding, sudden temperature changes, or the presence of predators can induce stress, leading to the formation of soft-shelled eggs.
Young hens, or pullets, often lay soft-shelled eggs when they first start laying. This is because their bodies are getting used to laying, and their reproductive systems are not yet fully developed. As a result, their eggs may have thin shells that crack easily. This usually stops once they mature and their reproductive systems fully develop.
Older hens may also lay thin-shelled eggs since a larger amount of shell must encompass a larger amount of yolk and white. Older hens may also experience difficulty in absorbing and utilizing calcium efficiently, resulting in softer eggs.
Stress can also cause hens to lay eggs prematurely, without a shell. For example, being chased by children, dogs, or other predators can cause great stress and fright for a flock. Other sources of stress include extreme temperature variations, weather changes, or the addition of new flock members.
To reduce stress, it is important to identify and eliminate stressors in the chicken's environment. Provide ample space, nesting boxes, and a comfortable coop to create a secure and stress-free atmosphere.
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Illness
Infectious bronchitis can start suddenly and spreads rapidly. Signs to look out for include coughing, sneezing, and rattling sounds in the throat, which may be more noticeable at night. The only way to get rid of infectious bronchitis is to remove the infected chickens, clean, disinfect, and start over. Therefore, preventing exposure in the first place is crucial.
Other illnesses and health problems can also cause abnormal eggshells. For example, a prolapsed vent can lead to bloody eggshells, which can then lead to vent pecking or cannibalism by other chickens. In addition, a hen's body may not be absorbing calcium correctly, leading to soft-shelled eggs, and this could be a sign of a more serious underlying health issue.
If you notice consistent egg abnormalities over several days or weeks, it is recommended to consult a poultry veterinarian to check for possible illness, especially if more than one chicken seems to be affected.
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Age
A chicken's age can be a factor in the texture of its eggshells. When pullets or young hens first start laying eggs, their first eggs are often soft-shelled, shell-less, or thin-shelled. This is because their bodies are still getting used to laying, and their egg-laying cycle has not yet settled.
Older hens, on the other hand, may also lay eggs with rough or pimpled shells. As hens age, the whites or albumen in their eggs become thinner, and since it is more difficult for the shell to encase a watery substance, the shell can end up with bumps and ridges. Older hens also lay larger eggs, resulting in thinner shells. Thin shells in aging hens can also be a result of progressive osteoporosis, where the hen loses bone structure as her body uses skeletal calcium to form eggshells.
While age can be a factor in eggshell texture, it is important to note that other factors such as nutrition, stress, and disease can also play a role.
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Frequently asked questions
A rough-feeling shell could be caused by a number of factors, including:
- Improper nutrition: A calcium deficiency can cause soft-shelled eggs, while too much calcium can make eggshells overly thick.
- Stress: Stress can disrupt a hen's digestive and immune systems, leading to soft eggshells.
- Age: Older hens may experience a decline in their ability to produce strong eggshells and may have difficulty absorbing calcium efficiently.
Here are some ways to prevent rough-feeling shells:
- Supplement with calcium: Offer crushed eggshells or oyster shells to boost calcium intake.
- Vitamin D: Ensure your chickens receive sufficient vitamin D through their diet or exposure to natural sunlight.
- Reduce stressors: Identify and eliminate sources of stress in the chicken's environment, such as loud noises, overcrowding, or sudden temperature changes.
In addition to nutrition, stress, and age, other factors that can affect egg shells include:
- Disease: Respiratory diseases can cause thin or missing shells. Infectious bronchitis, caused by a coronavirus, is a common respiratory illness that can result in shell anomalies.
- Genetics: Some hens may be genetically predisposed to laying eggs with thin or soft shells.
- Environmental factors: Extreme temperature variations, weather changes, or the addition of new flock members can impact egg shell quality.
