Layer keel bone fractures can result from perch collisions.

Layer keel bone fractures can result from perch collisions.A new research study shows the majority of keel bone damage originates from collisions with perches inside the layer house. Dr. Maja Makagon, assistant professor of applied animal behavior at University of California, Davis’ Department of Animal Science, discussed the results of a study conducted to analyze keel bone damage in a layer environment. Makagon, who spoke as part of the Egg Industry Center Egg Industry Issues Forum in Columbus, Ohio, said the study utilized accelerometers and 3D imaging technology to study the force of the collisions and measure their effects on the keel bone. The keel is an extension of the sternum that provides an anchor for the bird’s wing muscles and provides leverage for flight. As laying hens are being removed from a conventional cage environment, Makagon said, keel integrity is increasingly seen as an indicator of animal welfare. Damaged keels are associated with increased mortality, reduced egg production and egg quality, and keel damage is likely associated with pain for the animal. continue