Cannibalism in poultry is the act of one individual of a poultry species consuming all or part of another individual of the same species as food. It commonly occurs in flocks of domestic hens reared for egg production, although it can also occur in domestic turkeys, pheasants and other poultry species.[1] Poultry create a social order of dominance known as pecking order.[1] When pressure occurs within the flock, pecking can increase in aggression and escalate to cannibalism.[2] Cannibalism can occur as a consequence of feather pecking which has caused denuded areas and bleeding on a bird's skin.[3] Cannibalism can cause large mortality rates within the flock and large decreases in production due to the stress it causes. Vent pecking, sometimes called 'cloacal cannibalism', is considered to be a separate form of cannibalistic pecking as this occurs in well-feathered birds and only the cloaca is targeted.[4][5] There are several causes that can lead to cannibalism such as: light and overheating, crowd size, nutrition, injury/death, genetics and learned behaviour.[6][1][2] Research has been conducted to attempt to understand why poultry engage in this behaviour, as it is not totally understood. There are known methods of control to reduce cannibalism such as crowd size control, beak trimming, light manipulation, perches, selective genetics and eyewear.
^ abc"Feather Pecking and Cannibalism in Small and Backyard Poultry Flocks – Small and backyard poultry". poultry.extension.org. Retrieved 2019-11-17.
^ abBennewitz, J.; Bögelein, S.; Stratz, P.; Rodehutscord, M.; Piepho, H. P.; Kjaer, J. B.; Bessei, W. (2014-04-01). "Genetic parameters for feather pecking and aggressive behavior in a large F2-cross of laying hens using generalized linear mixed models". Poultry Science. 93 (4): 810–817. doi:10.3382/ps.2013-03638. ISSN 0032-5791. PMID 24706957.
^Savory, J., (2010). Nutrition, feeding and drinking behaviour, and welfare. In The Welfare of Domestic Fowl and Other Captive Birds, I.J.H. Duncan and P. Hawkins (Eds). Springer. pp. 165-188
^Rodenburg, T.B., Komen, H., Ellen, E.D., Uitdehaag, K.A., and van Arendonk, J.A.M., (2008). Selection method and early-life history affect behavioural development, feather pecking and cannibalism in laying hens: A review. Applied Animal Behaviour Science, 110: 217-228
^Koene, Paul (1997). "Cannibalism in Extensive Poultry Keeping: Interfacing Genetics and Welfare". Ethology Group.
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