
Chickens are known to peck at each other for a variety of reasons. One of the main reasons is to establish a pecking order, which is a way for them to figure out their place in the flock. This type of pecking is usually gentle and not considered aggressive. However, sometimes chickens may engage in aggressive pecking, which can lead to injuries and feather loss. Aggressive pecking can be caused by various factors such as overcrowding, stress, lack of protein in the diet, or boredom. Additionally, certain breeds with distinct features may become targets for pecking. Introducing distractions, providing adequate space, and ensuring a balanced diet can help mitigate excessive pecking behavior.
| Characteristics | Values |
|---|---|
| Reason | Pecking order |
| Boredom | |
| Lack of space | |
| Stress | |
| Lack of protein in diet | |
| Protecting the flock | |
| Lack of stimulation | |
| Action | Provide ample space |
| Provide stimulation | |
| Provide protein-rich food | |
| Separate injured or sick chickens | |
| Reintroduce chickens in groups |
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What You'll Learn

Establishing a pecking order
Chickens are social animals that live in flocks, and within these flocks, there is a social hierarchy known as the "pecking order". This term was coined by Norwegian zoologist Thorleif Schjelderup-Ebbe in 1921, who observed that chickens would peck each other to establish their place in the hierarchy. The top hen is considered the "alpha" and is usually respected by the rest of the flock.
The pecking order is established through a process of pecking, which can start as early as the brooder days. Chickens will constantly peck each other to see who will come out on top. This behaviour carries into their adult stage, and the pecking can become more intense as they get older. It is important to note that the pecking order is not solely based on physical size, but also on personality and assertiveness.
There are several factors that can influence the intensity of pecking and the establishment of the pecking order. One factor is stress, which can be caused by overcrowding, changes in routine, or a lack of sufficient space to roam and play. Boredom is another common cause, especially during winter when there is limited fresh grass to forage on. Chickens may also peck at sick or injured flock members to protect the rest of the group, and this behaviour can sometimes lead to the death of the sick or injured chicken.
To minimise excessive pecking, chicken keepers should aim to provide a stress-free environment with ample space, entertainment, and a healthy, balanced diet. Different feeding stations can also be set up to prevent higher-ranking chickens from monopolising the food. By addressing these factors, chicken keepers can help establish a pecking order that is less intense and more stable.
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Boredom and lack of stimulation
Chickens are social animals that establish a pecking order to figure out who is in charge. This is a natural behaviour that starts early in the brooder. While this pecking order is important for the functioning of the flock, it can sometimes lead to aggressive behaviour and injuries.
If you suspect that boredom is causing your chickens to peck at each other, try providing them with more space and interactive objects to keep them mentally stimulated. You can also try boredom busters, such as a block for them to peck on, which can also provide additional nutrients. By taking these steps, you can help reduce excessive pecking and promote a peaceful flock.
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Overcrowding and stress
The stress caused by overcrowding can be a major factor in the development of intestinal issues in chickens. Studies have shown that overcrowding stress decreases macrophage activity and increases the invasion of Salmonella Enteritidis in broiler chickens. This is due to the impact of stress on the hypothalamic-pituitary-adrenal axis, which can increase corticosterone levels and compromise the intestinal immune barrier, allowing pathogenic bacteria to enter the intestinal mucosa. As a result, chickens may experience inflammatory infiltration and decreased nutrient absorption, making them more susceptible to infections.
Additionally, overcrowding can lead to increased mortality, leg problems, behavioural changes, and susceptibility to diseases in chickens. It can also cause boredom, which is a common trigger for pecking behaviour. Providing adequate space, enrichment, and exercise can help alleviate boredom and reduce pecking. Ensuring proper nutrition, especially sufficient protein intake, is also crucial in managing stress and pecking behaviour in chickens.
To mitigate the negative impacts of overcrowding and stress, it is essential to provide adequate space for each chicken. In a coop, allowing for at least 4 square feet of floor space per adult chicken is recommended. Additionally, providing environmental enrichment, such as scattering treats across their yard or adding diversionary activities to their routine, can help reduce boredom and associated pecking behaviour.
Supplementing the diet of chickens with vitamins and probiotics has also been found to alleviate environmental stress and improve welfare. Probiotics have been shown to be effective in mitigating overcrowding stress in broilers, and vitamin C supplementation has been suggested to improve antioxidant capacity in laying hens. By addressing overcrowding and providing stress-relieving interventions, the negative consequences on chicken health and behaviour can be minimised.
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Lack of protein
Chickens are social animals that thrive in groups. However, when kept in captivity, their natural instincts can sometimes lead to unwanted behaviours, such as pecking at each other. While some pecking is normal and to be expected, especially as chickens establish a "pecking order", excessive pecking can be a sign of underlying issues. One of the causes of this behaviour is a lack of protein in their diet.
Feathers are made of protein, so when a chicken's body senses a protein deficiency, it may turn to feathers as a source of nutrition. This results in chickens pecking at and plucking the feathers of their flockmates. This behaviour is often observed in poultry yards where chickens are fed low-protein feeds such as scratch and corn.
To address this issue, it is important to ensure that your chickens are receiving a balanced diet with adequate protein. Their feed should be supplemented with protein-rich foods, especially during the moulting season when chickens need extra protein for feather regrowth. You can provide them with high-protein treats or switch to a poultry growers pellet for a month to boost their protein intake. Additionally, consider natural sources of protein such as bugs and worms during the warmer months.
It is also crucial to monitor the flock's health and separate any injured chickens from the group until they have healed. Wounded chickens can trigger aggressive behaviour in their flockmates, leading to further pecking and potential injury. By providing a nutritious diet and a safe environment, you can help reduce excessive pecking and promote the well-being of your chickens.
While lack of protein is one factor contributing to pecking behaviour, it is important to consider other aspects of chicken husbandry as well. Stress from overcrowding, boredom, and changes in routine can also trigger pecking. By addressing these issues and providing a healthy and stimulating environment, you can help minimise excessive pecking and promote harmonious flock dynamics.
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Aggression and bullying
Chickens have instinctive protective abilities and will do anything to keep the flock well and safe. This means that a sick or injured chicken may be pecked at or driven away by the other chickens to protect the flock. If a chicken is injured or sick, it is important to separate them from the flock to avoid further pecking and to prevent the spread of disease.
Pecking can also be caused by stress from overcrowding, boredom, or a lack of protein in the diet. Chickens that are bored or have limited space may exhibit destructive behaviour and start pecking at each other. Providing distractions, such as scattering treats across their yard, can help alleviate this behaviour. In addition, ensuring that chickens have enough space and protein-rich food can reduce aggression and bullying within the flock.
If pecking becomes excessive and causes injury or defeathering, it is important to take action to address the underlying issues. This may include providing more space, reducing stress, or improving the diet of the flock.
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