Feather pecking
Feather pecking is redirected foraging behavior causing severe welfare issues.
Feather pecking is a behavior observed most frequently among domestic hens reared for egg production, though it also occurs in other poultry such as pheasants, turkeys, ducks, broiler chickens, and occasionally farmed ostriches. It involves one bird repeatedly pecking at the feathers of another, with severity ranging from mild investigatory pecking to severe pecking that can cause pain, skin trauma, bleeding, cannibalism, and death. This behavior is a major welfare and economic problem for the egg industry, particularly in non-cage systems, and is expected to become more pressing following EU legislation banning barren battery cages.
- Type
- Behavioral problem in poultry
- Affected species
- Domestic hens, pheasants, turkeys, ducks, broiler chickens, ostriches
- Prevalence in free range flocks
- 57–86% of flocks affected; up to 99% of hens within a flock
- Annual deaths in uk free range
- 220,000
- Key legislation
- Council Directive 1999/74/EC (ban on barren battery cages, 2012)
- Distinct from
- Feather-plucking (self-directed) and aggression
Lore & Background
Feather pecking is considered a redirected behavior, developing either from ground pecking or pecking during dustbathing, with the former hypothesis now more favored. Captive birds in barren environments with limited foraging opportunities and nutrient-dense diets consume food in minutes rather than hours, redirecting foraging activity to the feathers of conspecifics. It is not aggression; aggressive pecking targets the head or comb, while feather pecking targets the base of the tail, uropygial gland, back, tail, and wing feathers. Feather pecking is also distinct from feather-plucking, where isolated birds remove their own feathers.
Reader's Guide
Feather pecking is a multifactorial problem with numerous risk factors, including diet, genetics, housing, and hen behavior. Reducing it without beak-trimming is a key goal for the poultry industry. Beak-trimming, or partial beak amputation, causes welfare concerns due to nerve damage, potential neuromas, and phantom limb pain, and may impair hens' magnetoreception and grooming ability. Light manipulation is widely used but has drawbacks: low intensities hinder inspection and may cause panic when increased, and turkeys may suffer retinal detachment. The behavior rarely begins after 40 weeks of age, and early experience influences severe feather pecking later in life. Prevalence figures range from 57–86% of free-range flocks, with up to 99% of hens affected within a flock, and an estimated 4% of free-range hens die annually in the UK due to feather pecking.
Did You Know?
- Beak-trimming can cause neuromas and may impair hens' ability to orient using Earth's magnetic field.
- Feather pecking is considered redirected foraging behavior, often due to barren environments and nutrient-dense diets.
- Severe feather pecking can and does begin after 40 weeks of age, particularly in commercial flocks where outbreaks may occur at any age, including later in lay.
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