Chicken in the United States is a cheap and readily available meat. It is packed in a variety of formats, from whole roasting chickens to selections of one particular cut, such as thighs or wings. Highly automated, large-scale chicken farming and processing complexes run by large corporations fuel the American chicken market. The development of so-called factory farming sharply reduced the price and increased the availability of chicken, when this method was introduced in the 1920s.


The ancestor of today's domestic chicken is the wild red jungle fowl Gallus gallus, native to India and Southeast Asia. The red jungle fowl was first domesticated apparently for use in religious rituals involving cockfighting. The domesticated bird spread west-ward from India to Greece, and was later introduced to Western Europe by invading Roman armies. By the Roman era, chickens were used as food, both for their meat and for their eggs. Romans commonly carried them on their ships, as a convenient source of fresh food.

The first European settlers in North America brought chickens with them. But until the twentieth century, there was no chicken industry as such in this country. Care of the chicken flock was for the most part considered work for women and children. At that time, a typical hen laid only 30 eggs a year, and farm wives sold their excess at market as supplemental income. Chicken meat was usually only plentiful in the early summer, when chickens that had hatched in the spring were big enough to eat. Because chicken husbandry was primarily women's work, only as an adjunct to the major farm production, distribution channels were limited. Whereas railroads were built to bring cattle from the West to waiting urban markets, no such effort was put into chicken production, and chicken was available in cities more or less sporadically, with large seasonal jumps in prices and amount of supply.

Several inventors perfected chicken incubators in the late nineteenth century. These machines could keep hundreds of eggs at a time warm, and so made possible commercial breeding of chicks. In the nineteenth century, breeding of chickens was mostly a hobby, with many poultry enthusiasts raising fabulously feathered chickens. Showy and colorful exotic breeds were the most popular; however, with the advent of mechanical incubators, poultry breeders began to breed birds with good egg-laying and meat production potential.

The first person in the United States to raise broiler chickens (chickens for meat) on a large scale strictly for profit was a Mrs. Wilmer Steele, of Ocean View, Delaware. In 1923, Mrs. Steele bought 500 chicks and sold the surviving 387 of them when they matured to 2 lb (0.9 kg). Her profit was enormous, and within just a few years, Delaware became the center of a thriving chicken industry. In 1926, the state produced around one million broiler chickens.

By 1934, it was raising about seven million chickens annually. In the 1930s, the National Poultry Improvement Plan, a federal-state cooperative mission, helped chicken farmers use scientific breeding principles to produce superior strains of birds. At this time, birds were first bred specifically for meat production. The important qualities of broiler chickens were rapid growth, white feathers (dark feathers left unsightly stubs), and meaty breasts and thighs. The advances in breeding made quite an impact: in 1900, a typical chick took 16 weeks to reach 2 lb (0.9 kg), which was considered frying weight. Today, a commercial broiler chicken lives only about six weeks, and weighs about 4 lb (1.8 kg) at slaughter.

Advances in nutrition were also important to the development of a commercial chicken industry. Chicken nutrition has actually been studied more, and is better understood, than human nutrition. The combined efforts of the feed industry, the U.S. Department of Agriculture, and agricultural scientists led to optimum feed. The ratio of feed necessary per pound of chicken meat has fallen through this century, making chicken ever cheaper to produce. By the 1950s, several large companies had integrated feed production with chicken farming and meat processing, so that only a few large corporations controlled a high percentage of the chicken produced in this country. These major producers each slaughter millions of chickens a week.

Commercial chicken

The production complex

Chicken production is typically carried out at so-called complexes. Each complex contains a feed mill, a hatchery, a processing plant, and chicken farms where the chicks are raised, usually in a 30-40 mi (48.3-64.4 km) radius from the processing plant. Contract farmers receive chicks from the hatchery, and house them in climate-controlled chicken houses. The houses are typically 400 x 50 ft (122 x 15.24 m), and hold up to 20,000 chickens. The interior is open, with no cages or partitions. When the chickens are old enough for slaughter, they are collected and shipped to the processing plant.

The hatchery


Growing out



Defeathering and evisceration

Chilling and cutting

Quality Control

Quality control is a particularly important issue in poultry farming because the end product is raw meat, which has the potential to carry disease-causing microorganisms. To prevent diseases in the chickens themselves, the chicks are vaccinated for common avian diseases. Veterinarians visit the growing-out farms and tend to any sick birds. Corporations that contract with the growing-out farms also typically send a service technician out on a weekly visit to each farm to monitor conditions.

Quality control at chicken-processing plants is done by the company and also by inspectors from the U.S. Department of Agriculture. A USDA inspector is required to be in the plant whenever chickens are being slaughtered. The government inspector examines the birds both before and after slaughter for obvious signs of disease and for injury, such as broken wings. The meat from injured parts is not usable.

In a typical process, there are two critical control points where the company continually monitors conditions. There may be additional control points as well. The first critical control point is just before the cleaned carcass goes to the chiller. An inspector pulls carcasses at random and visually inspects them under bright light. No fecal matter is allowed on the carcass at this point. If any is found in the random check, the production line must be stopped and all the birds that have gone through the chiller since the last inspection must be rewashed and chilled. The second critical control point is when the birds come out of the chiller. The internal temperature of the carcass must be 40° F (4.4° C) or lower at this stage. Inspectors make random sample checks to verify internal temperatures. Though these are the most important control points, each plant designs its own quality control program, and inspectors may also periodically verify the temperature of the scalding water, check the automatic equipment, and whatever else the company deems necessary.

Until 1998, USDA inspectors at chicken processing plants were required to do only what is called an organaleptic test of the chickens before and after slaughter. This translates to looking and smelling; that is, inspectors verified that the birds were disease-free and healthy by looking them over and perhaps giving the carcass a quick sniff.

In 1998, the USDA instituted a new quality control program for all meat processors known as Hazard Analysis Critical Control Points, or HACCP. Under HACCP, in addition to the organaleptic method, inspectors are also required to take periodic microbiological tests to look for dangerous bacteria. The most problematic bacteria in chicken meat are salmonella. Though this organism is killed with proper cooking of the meat, it can cause illness if the consumer does not handle the meat properly. In the 1980s, 50% of all chicken in the United States was purported to be infected with salmonella. The industry altered its quality control procedures, and brought the incidence down to 16% in 1996, and to below 10% in 1998, according to the USDA. Under HACCP, chicken must be randomly tested for salmonella at the production plant, and the rate of infection must be lower than 20%. Also under HACCP, USDA inspectors have the authority to shut down plants that they deem dirty or unsafe. The plant is not allowed to re-open until it comes up with a plan for remedying the situation. Some incidents that caused chicken processing plants to be shut in 1998 included carcasses falling on the floor, rodent infestation of the facility, and most commonly, failure to prevent fecal contamination.


Many of the byproducts of chicken slaughter can be used. Chicken feet are removed at the processing plant because they are not considered edible in the United States. However, chicken feet are a delicacy in Asia, and so large amounts of them are exported. The feathers can be ground up and used as a protein supplement in animal feed. Substandard meat is also commonly sold to pet food makers. However, many chickens die before slaughter, either at the growing-out farm or en route to the processing plant. These birds are disposed of in landfills. Sick or deformed chicks are culled—taken from the flock and killed (usually by wringing the neck)—after hatching, and these bodies must also be disposed. Unused viscera and parts also produce waste in chicken processing.

A significant waste produced in chicken farming is the feces of the birds. Because the flocks are so large, with 20,000 birds typical for a broiler growing-out farm, the amount of feces is enormous. Decomposing poultry manure produces ammonia, an irritating gas that can cause disease and distress in poultry workers and in the chickens themselves if chicken houses are not adequately cleaned and ventilated. Flies are attracted to chicken manure, and large-scale broiler farming may cause an unwelcome increase in the fly population in surrounding areas. The odor associated with large-scale chicken farming can also be a problem for neighbors. Of more concern than odor is the threat to water quality by run-off from chicken farming. Some chicken manure is used as fertilizer for crops, and when it rains, excessive nitrogen and phosphorus are washed into nearby bodies of water. Outbreaks of a harmful bacteria in the Chesapeake Bay area in 1997 were blamed on water conditions caused by run-off from chicken farms. To control run-off, chicken producers may opt to alter the feed they give their broilers, adding enzymes that help breakdown some of the nutrients in the waste.

Where to Learn More


Davis, Karen. Prisoned Chickens, Poisoned Eggs Summertown, Tennessee: Book Publishing Company, 1996.

Smith, Page, and Daniel, Charles. The Chicken Book. Boston: Little, Brown, 1975.


Gordon, John Steele. "The Chicken Story." American Heritage (September 1996).

"Poultry Growers Unite to Address Waste Issue." New York Times (August 25, 1998).

Sharpe, Rochelle. "U.S. Shut 34 Meat and Poultry Plants in Quarter Due to Sanitation or Safety ."Wall Street Journal (May 8,1998).

Angela Woodward

Also read article about Chicken from Wikipedia

User Contributions:

this is a useful site for food safety specialist who are still studying in universities.i am a student in the university of swaziland and my programme is envirnmental health science and my speciality is food sanitation and technology.what are the proper prerequisites for HACCP implementation in poultry processing plant OR what the this that the plant have to have in place before implementing HACCP

Comment about this article, ask questions, or add new information about this topic: