The most numerous, least protected
animal on the farm and factory
On the lives of the birds behind the drumstick and the breakfast egg.
Chickens are the most numerous farm animals on earth, and in the United States they are among the least protected. Roughly nine billion are raised for meat here every year; nearly 300 million hens lay the 90 billion eggs we eat. Almost none of them live anything like the life on the carton.
Bred to outgrow their own bodies
A modern meat chicken reaches slaughter weight in five to six weeks. Over the past fifty years, selective breeding has pushed broiler growth rates up by several hundred percent. The skeleton, heart and lungs can’t keep pace with the muscle.
The science here isn’t seriously disputed. A recent review of the research found strong evidence that faster growth worsens welfare — more leg disorders, poorer ability to walk, more cardiovascular disease, more breast-muscle disease — and that slower-growing breeds do significantly better. Denmark’s animal welfare minister has now called for a ban on fast-growing breeds, nationally and across the EU. In the US, the industry standard is still the fast-growing bird, crowded into windowless sheds, many too heavy to walk comfortably to food and water.
The end of the line is no kinder. Federal humane slaughter law doesn’t cover poultry. Most birds are hung upside down by their legs on a moving shackle line and stunned in an electrified water bath before their throats are cut. Some miss the stun, or the blade, and are fully conscious when they reach the next stage. At 9 billion birds a year, even a small failure rate means millions of animals.
The hen’s life
A laying hen is bred to produce around 300 eggs a year — a small fraction of what her wild ancestors would manage. The cost is paid in her skeleton and cardiovascular system. And she is disposable: hens are typically slaughtered at one to two years old, once production slips, though a chicken can live many years longer.
For decades the defining image of egg production has been the battery cage. The industry’s own guidelines allow about 67 square inches per hen — less than a sheet of printer paper — for her entire laying life, with no room to spread her wings, dust-bathe, nest or perch.
Cage-free reform is real progress. By the industry’s own count, around 146 million hens were cage-free by spring 2026 — roughly half the national flock, up from about one in twenty a decade earlier. But that also means roughly half are still caged, and “cage-free” doesn’t mean outdoors: it typically means a crowded barn. To limit the feather-pecking that crowding provokes, hens have their beaks trimmed with a hot blade or infrared beam within days of hatching, a procedure that produces signs of pain.
Beyond chickens: turkeys, ducks, geese and quail
Other farmed birds face welfare problems shaped by their species and production systems. Turkeys are commonly raised in large indoor flocks. Rapid growth, crowding, wet litter, poor air quality and limited enrichment are linked with lameness, foot-pad injuries, pecking wounds and restricted behavior. EFSA’s 2026 assessment recommends more usable space, dry litter, foraging and perching opportunities, good air quality, and breeding that improves leg health (EFSA AHAW Panel, 2026).
Ducks and geese are also often raised indoors on litter floors, sometimes without access to open water for bathing. Without water deep enough to immerse their heads, birds may be unable to perform important bathing and comfort behaviors. EFSA identified restricted movement, poor litter, lack of enrichment and inability to perform exploratory, foraging and nesting behaviors among the welfare concerns for ducks, geese and quail. Quail may be kept in cage systems that limit dust-bathing, nesting, jumping and foraging. These findings describe assessed European production systems; exact practices and legal protections vary by country and producer (EFSA AHAW Panel, 2023).
The chicks nobody wants
Because egg-laying breeds have been separated from meat breeds, male chicks have no economic value to the egg industry. They can’t lay, and they don’t grow fast enough to be profitable as meat. So within hours of hatching they are killed — commonly by maceration, in which purpose-built equipment rapidly kills chicks with rotating blades or rollers, or by gas. Estimates for the US run at 300 to 350 million chicks a year. Maceration is intended to cause immediate death when equipment is correctly maintained and operated, but failures such as overloading or poorly maintained machinery can cause severe suffering (Humane Slaughter Association, n.d.). The scale is enormous: even a brief, routine step in the hatchery means hundreds of millions of individual lives ended each year.
This one is solvable. France and Germany have banned the practice, and “in-ovo sexing” — identifying the sex of an embryo before it hatches — covered roughly 15 percent of the EU’s laying flock by 2023. In the US, the first in-ovo-sexed eggs reached shelves in mid-2025. The technology exists, and it costs more. What’s missing is a rule requiring it.
The environmental footprint
Chicken production concentrates large numbers of birds, feed, water use and waste. Manure and bedding become poultry litter, which can be a useful fertilizer when applied at rates crops can use. Where too much litter is spread on too little land, or it is applied before heavy rain or near waterways, nitrogen and phosphorus can wash or leach into water. Excess nutrients can fuel algal growth and harm aquatic ecosystems; nitrate can also contaminate groundwater. Litter management therefore matters, but it does not erase the environmental costs of producing feed and managing waste at industrial scale (Harmel et al., 2009; U.S. Environmental Protection Agency, 2003).
Arsenic and antibiotics
Arsenic-based drugs were once used in poultry production for purposes including disease control and growth-related benefits. FDA testing found increased inorganic arsenic in livers of chickens treated with roxarsone. Manufacturers withdrew the poultry approvals for roxarsone and several other arsenical drugs in 2014; the last remaining arsenical drug, nitarsone, was discontinued and withdrawn, and was unavailable for the 2016 growing season. This is a legacy issue, not a claim that arsenic drugs are routinely used in U.S. poultry today (U.S. Food and Drug Administration, n.d.-a).
Antibiotics are also used in poultry to treat, control or prevent bacterial disease. Medically important drugs are no longer approved for growth promotion in U.S. food animals, and FDA says their use requires veterinary oversight; treatment can still be necessary to protect sick animals. Any use can select for resistant bacteria. Those bacteria can spread through food, animal contact and manure entering the environment. FDA reports that sales of medically important antimicrobials for food-producing animals fell 37 percent from their 2015 peak to 2023, but sales are not the same as measured use on farms, and poultry use data remain incomplete (U.S. Centers for Disease Control and Prevention, n.d.; U.S. Food and Drug Administration, 2012, 2024).
The objections worth taking seriously
“Cage-free isn’t actually kinder.” Partly fair. Industry-funded research has found roughly double the hen mortality in cage-free aviaries, driven by pecking, disease and injuries from collisions; other studies find no difference, and animal-welfare analysts generally expect an initial spike in mortality that declines as producers learn to manage the systems. The more defensible conclusion isn’t that cages are fine. It’s that cage-free done badly is not enough, and that the welfare ceiling is much higher without cages.
“It will cost too much.” It will cost something. Egg prices have swung hard in recent years, though avian flu has driven much of that volatility and economists have argued over how much belongs to cage-free laws. The honest question is how much extra a decent life for a hen is worth to the person buying the egg.
“They’re just chickens.” That is the objection that matters most, and it’s a moral claim rather than a factual one. The science on chicken pain and distress is solid; what we owe them is what the argument is about. But few people defend causing suffering that serves no purpose beyond shaving a few cents off a price.
What would actually change things
The levers are not exotic: end the use of the fastest-growing breeds, require stunning-before-slaughter and humane handling rules that cover poultry, mandate in-ovo sexing, and set real space and enrichment standards in cage-free systems. Individuals can push the same direction by buying from producers with credible third-party welfare standards — or by eating fewer chickens and eggs.
None of that requires believing that eating animals is always wrong. It only requires believing that how we treat them matters — and that the cheapest possible chicken is not a price worth paying.
References
European Food Safety Authority Panel on Animal Health and Welfare (EFSA AHAW Panel). (2023). Welfare of ducks, geese and quail on farm. EFSA Journal, 21(5), 7992. doi:10.2903/j.efsa.2023.7992.
European Food Safety Authority Panel on Animal Health and Welfare (EFSA AHAW Panel). (2026). Welfare assessment of turkeys (Meleagris gallopavo gallopavo) on farm. EFSA Journal, 24(2), e9851. doi:10.2903/j.efsa.2026.9851.
Harmel, R. D., Smith, D. R., Haney, R. L., & Dozier, M. (2009). Nitrogen and phosphorus runoff from cropland and pasture fields fertilized with poultry litter. Journal of Soil and Water Conservation, 64(6), 400–412. doi:10.2489/jswc.64.6.400.
Humane Slaughter Association. (n.d.). Chicks (less than 72 hours old) and embryonated eggs. Accessed October 30, 2026.
U.S. Centers for Disease Control and Prevention. (n.d.). Antimicrobial resistance facts: National Antimicrobial Resistance Monitoring System. Accessed October 30, 2026.
U.S. Environmental Protection Agency. (2003). National management measures to control nonpoint source pollution from agriculture (Chapter 4: Animal feeding operations).
U.S. Food and Drug Administration. (2012). Guidance for industry #209: The judicious use of medically important antimicrobial drugs in food-producing animals.
U.S. Food and Drug Administration. (n.d.). Arsenic-based animal drugs and poultry. Accessed October 30, 2026.
U.S. Food and Drug Administration. (2024). 2023 summary report on antimicrobials sold or distributed for use in food-producing animals.