Jake Harper
The sternum is a crucial bone in the axial skeleton of chickens, providing a large surface area for the attachment of powerful flight muscles. This bone is also known as the keelbone or keeled sternum, and it is a prominent, ridge-like structure on a chicken's breastbone. The keeled sternum is a common feature in many bird species, and its presence as a flat bone projecting forward with a ridge has been integral to the evolutionary journey of birds, enabling them to take flight.
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What You'll Learn
- The crest of the sternum, or keel, is a flat bone that projects forward
- The bone has a prominent ridge, which gives it its alternative name: keelbone
- The crest of the sternum is a common feature in many bird species
- It serves as an anchor for the muscles used for flight and enables the flapping motion
- Injuries to the bone can cause pain, stress, and reduced productivity in chickens
The crest of the sternum, or keel, is a flat bone that projects forward
The chicken's sternum, or keel bone, is a flat, quadrilateral bone that projects forward from the chicken's breast. It is a critical anatomical feature, providing a large surface area for the attachment of the major flight muscles in flying species and meat muscles in meat-producing breeds. The keel bone gets its name from its resemblance to the keel of a boat.
The sternum is a curved plate with processes extending from each angle and the middle of the cranial and caudal borders. It is situated in the dorsal region of the vertebral column of the chicken's axial skeleton. The bone increases in size through the constant deposition of new layers of dense bone beneath the periosteum. During this process, osteoclasts absorb the bone from within, forming cavities that contain marrow and later develop into air sacs.
The keel bone is an essential attachment point for the powerful muscles used in flight, helping birds achieve the necessary lift when flapping their wings. In meat-producing chicken breeds, the sternum serves as an attachment site for meat muscles. The bone is also important as it contains extensions of air sac components of the respiratory system.
Injuries to the sternum can cause pain, stress, increased susceptibility to disease, reduced activity, decreased meat quality, and impaired respiratory function. Causes of such injuries include elevated egg production, poor bone health, and collisions with other chickens or solid objects, which may be made worse by poor feathering, coarse or wet bedding, or increased time sitting on the sternum.
The chicken's sternum is also known as the furcula, or wishbone, and is formed by the fusion of the two clavicles or collarbones. It is situated at the front of the chicken's chest and plays a crucial role in maintaining the stability of the shoulder girdle during flight, allowing for coordination and strength in the wings.
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The bone has a prominent ridge, which gives it its alternative name: keelbone
The sternum is a large, curved bone in the chicken's skeleton. It is situated in the dorsal region of the vertebral column of the axial skeleton. The bone has a prominent ridge, which gives it its alternative name: keelbone. This name comes from its resemblance to the keel of a boat.
The keelbone is a critical anatomical feature in birds, including chickens, as it serves as an attachment point for the powerful muscles used in flight. It provides a large surface area for the strong attachment of these muscles, which help birds achieve the necessary lift when their wings flap. The keelbone is larger in birds that are strong fliers, like eagles, compared to chickens that have a smaller keel since they do not typically fly long distances.
The sternum also serves as an attachment site for meat muscles in meat-producing chicken species. In addition, the bone contains extensions of air sac components of the respiratory system. Injuries to the sternum can cause pain, stress, increased susceptibility to disease, reduced activity, reduced productivity, reduced meat quality, and impaired respiratory function.
The medial caudal process or keel extends from the tip of the sternal crest. The sternum increases in size by the constant deposition of new layers of dense bone beneath the periosteum. During this process, osteoclasts absorb the bone from within, forming cavities that contain marrow and later form air sacs.
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The crest of the sternum is a common feature in many bird species
The crest of the sternum, also known as the keel bone, is a prominent structure on the breast of many bird species, including chickens. It is a critical anatomical feature that supports the flight muscles necessary for flapping their wings. The keel bone gets its name from its resemblance to the keel of a boat.
In chickens, the sternum is a quadrilateral, curved plate with processes extending from each angle and the middle of the cranial and caudal borders. It is situated in the dorsal region of the vertebral column of the axial skeleton. The sternum increases in size through the constant deposition of new layers of dense bone beneath the periosteum. This process results in the formation of cavities that contain marrow and later develop into air sacs.
The keel bone serves as an attachment point for the powerful muscles used in flight, helping birds achieve the necessary lift when flapping their wings. It is larger in bird species that are strong fliers, such as eagles, compared to chickens that have a smaller keel since they typically do not fly long distances.
The furcula, commonly known as the wishbone, is another important bone in the chicken's skeletal structure. It is formed by the fusion of the two clavicles or collarbones and is situated at the front of the chicken's chest. The furcula provides stability and additional support to the shoulder girdle during flight movements, allowing for coordination and strength in the wings.
Overall, the crest of the sternum, or keel bone, is a crucial feature in many bird species, including chickens, as it enables flight and provides structural support for the body.
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It serves as an anchor for the muscles used for flight and enables the flapping motion
The sternum is a critical anatomical feature in birds, including chickens, that supports the flight muscles necessary for flapping their wings. The breastbone of a chicken, also known as the keel bone, serves as an anchor for the muscles used for flight. It gets its name from its resemblance to the keel of a boat. The keel bone is a prominent structure on the breast of birds, providing a large surface area for the strong attachment of the main muscles used for flight.
The furcula, or wishbone, is formed by the fusion of the two clavicles (collarbones) and is situated at the front of the chicken's chest. It plays a crucial role in maintaining the stability of the shoulder girdle during flight movements, allowing for coordination and strength in the wings. The furcula provides a firm base of support for the wing and acts like a spring. An opening formed by the shape of the scapula, coracoid, and clavicle where they join provides a passage for the tendon of the muscle supracoracoides for connection to the humerus.
The sternum is a quadrilateral, curved plate with processes extending from each angle and the middle of the cranial and caudal borders. It is situated in the dorsal region of the vertebral column of the chicken's axial skeleton. The sternum increases in size by the constant deposition of new layers of dense bone beneath the periosteum. During this process, osteoclasts absorb the bone from within, forming cavities that contain marrow and later form air sacs.
The keel bone and furcula are critical to the chicken's skeletal structure and play a role in its ability to move and behave like a bird. While domesticated chickens are generally not active fliers like their wild counterparts, the keel bone is larger in birds that are strong fliers, such as eagles, compared to chickens that have a smaller keel since they do not typically fly long distances.
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Injuries to the bone can cause pain, stress, and reduced productivity in chickens
The sternum is a quadrilateral, curved plate with processes extending from each angle and the middle of the cranial and caudal borders. It is situated in the dorsal region of the vertebral column of the chicken's axial skeleton. The medial caudal process or keel extends from the tip of the sternal crest.
Injuries to bones can cause pain, stress, and reduced productivity in chickens. Fractures, or broken bones, are a common type of injury in chickens that can cause significant pain and distress. These fractures typically occur due to high-force impacts or falls, but chickens with underlying conditions that weaken their bones, such as osteoporosis, are also at a higher risk of fractures. Osteoporosis is a common issue in egg-laying hens, as modern hybrids produce one egg per day for 50 weeks, causing a cessation of normal bone turnover. As a result, only medullary bone is formed, which has limited structural value and increases the risk of fractures.
Bone injuries can lead to reduced productivity in chickens due to the pain and immobility they cause. Chickens with bone fractures may require surgery, bandaging, splinting, or physical therapy, all of which can impact their movement and ability to perform regular tasks. Additionally, the risk of bone injuries and fractures can be influenced by nutritional factors. For example, providing supplements such as alpha-ketoglutarate or ß-hydroxy-ß-methylbutyrate can improve bone metabolism and muscle quality in laying hens. Adequate nutrition, including calcium, inorganic phosphorus, vitamin D, and vitamin K, is crucial for skeletal health and can help reduce the risk of fractures.
The impact of bone injuries on chickens' productivity and overall welfare is a significant concern. Surveys indicate that 30% of caged laying hens suffer from at least one fracture in their lifetime, highlighting the prevalence and severity of this issue. Therefore, understanding the causes and treatment options for bone injuries is essential to ensure the health and well-being of chickens.
Bone healing is a natural process, and treatment for fractures focuses on providing optimal conditions for the bone to heal. This may include surgery, bandaging, or splinting, followed by rest and physical therapy. By addressing bone injuries promptly and effectively, the negative impacts on the chicken's productivity and welfare can be minimised.
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Frequently asked questions
The crest of the sternum in a chicken is a flat bone projecting forward with a prominent ridge known as the "keel". It is a common feature in many bird species and serves as an anchor for robust flight muscles.
The sternum is a quadrilateral, curved plate with processes extending from each angle and the middle of the cranial and caudal borders. The keel is a prominent, ridge-like structure on the chicken's breastbone.
The crest of the sternum in a chicken serves as an attachment point for flight muscles, enabling the flapping motion during flight. It provides a large surface area for the strong attachment of the main muscles used for flight.
