Mason & Singer, Animal Factories, 1990, p. 39, note de-beaking started around 1940 when a San Diego poultry farmer found if he burned off the upper beaks of his chickens with a blowtorch, they were unable to pick and pull at each other's feathers. His neighbor adopted the idea but used a modified soldering iron instead. A few years later a local company began to manufacture the "Debeaker," a machine that sliced off the ends of birds' beaks with a hot blade. Broiler chicks are debeaked once because they're slaughtered before their beaks can grow back. [Some broiler producers no longer debeak, relying instead on youth, lethargy, and dim lighting to control behavior.] Laying hens and breeding flocks are debeaked, sometimes twice, during the first week of age and sometimes again between 12 and 20 weeks of age. It is recommended that turkey poults be debeaked between two and five weeks of age. Ducklings and goslings are debilled by slicing off the forward edge of the upper bill with an electric debeaking machine. An operator debeaks 12 to 15 birds a minute.
The modifications in the pecking and drinking behavior of birds following partial beak amputation [conforms with other reports] that partial beak amputation results in long-term (56 weeks) increases in dozing and general inactivity, behaviors associated with long-term chronic pain and depression."
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I've underlined and made bold where it says the beaks grow back.
The modifications in the pecking and drinking behavior of birds following partial beak amputation [conforms with other reports] that partial beak amputation results in long-term (56 weeks) increases in dozing and general inactivity, behaviors associated with long-term chronic pain and depression."
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I've underlined and made bold where it says the beaks grow back.
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