Editing Chicken (section)

=== Farming ===

{{Main|Poultry farming}}

Chickens are common and widespread domestic animals, with a total population of 23.7 billion {{As of|2018|lc=y}}.<ref>{{cite web|title=Number of chickens worldwide from 1990 to 2018.|url=https://www.statista.com/statistics/263962/number-of-chickens-worldwide-since-1990/|access-date=February 23, 2020|website=Statista|archive-date=November 27, 2020|archive-url=https://web.archive.org/web/20201127124744/https://www.statista.com/statistics/263962/number-of-chickens-worldwide-since-1990/|url-status=live}}</ref> More than 50 billion chickens are reared annually as a source of meat and eggs.<ref>{{Cite web |url=https://www.ciwf.org.uk/farm-animals/chickens/ |title=About chickens |publisher=[[Compassion in World Farming]] |access-date=April 25, 2017 |archive-url=https://web.archive.org/web/20170426063521/https://www.ciwf.org.uk/farm-animals/chickens/ |archive-date=April 26, 2017 |url-status=live }}</ref> In the United States alone, more than 8 billion chickens are slaughtered each year for meat,<ref>{{Cite web |url=https://usda.library.cornell.edu/concern/publications/pg15bd88s |title=Poultry Slaughter Annual Summary |last=Fereira |first=John |website=usda.mannlib.cornell.edu |access-date=April 25, 2017 |archive-url=https://web.archive.org/web/20170426063701/http://usda.mannlib.cornell.edu/MannUsda/viewDocumentInfo.do?documentID=1497 |archive-date=April 26, 2017 |url-status=live }}</ref> and more than 300 million chickens are reared for egg production.<ref>{{Cite web |url=https://usda.library.cornell.edu/concern/publications/1v53jw96n |title=Chickens and Eggs Annual Summary |last=Fereira |first=John |website=usda.mannlib.cornell.edu |access-date=April 25, 2017 |archive-url=https://web.archive.org/web/20170426061324/http://usda.mannlib.cornell.edu/MannUsda/viewDocumentInfo.do?documentID=1509 |archive-date=April 26, 2017 |url-status=live }}</ref> The vast majority of poultry is raised in [[Intensive animal farming|factory farms]]. According to the [[Worldwatch Institute]], 74% of the world's poultry meat and 68% of eggs are produced this way.<ref>{{cite web |title=Towards Happier Meals In A Globalized World |url=http://www.worldwatch.org/towards-happier-meals-globalized-world |publisher=[[Worldwatch Institute]] |access-date=May 29, 2014 |archive-url=https://web.archive.org/web/20140529153518/http://www.worldwatch.org/towards-happier-meals-globalized-world |archive-date=May 29, 2014 |url-status=dead }}</ref> An alternative to intensive poultry farming is [[free-range]] farming. Friction between these two main methods has led to long-term issues of [[ethical consumerism]]. Opponents of [[intensive farming]] argue that it harms the environment, creates human health risks and is inhumane towards [[Sentience in animals|sentient animals]].<ref>{{cite journal |last1=Ilea |first1=Ramona Cristina |title=Intensive Livestock Farming: Global Trends, Increased Environmental Concerns, and Ethical Solutions |journal=Journal of Agricultural and Environmental Ethics |date=April 2009 |volume=22 |issue=2 |pages=153–167 |doi=10.1007/s10806-008-9136-3 |bibcode=2009JAEE...22..153I |s2cid=154306257 }}</ref> Advocates of intensive farming say that their efficient systems save land and food resources owing to increased productivity, and that the animals are looked after in a controlled environment.<ref>{{cite journal |last1=Tilman |first1=David |last2=Cassman |first2=Kenneth G. |last3=Matson |first3=Pamela A. |last4=Naylor |first4=Rosamond |last5=Polasky |first5=Stephen |title=Agricultural sustainability and intensive production practices |journal=Nature |date=August 2002 |volume=418 |issue=6898 |pages=671–677 |doi=10.1038/nature01014 |pmid=12167873 |bibcode=2002Natur.418..671T |s2cid=3016610 }}</ref> Chickens farmed for meat are called [[broiler]]s. Broiler breeds typically take less than six weeks to reach slaughter size,<ref>{{cite web |url=https://www.animalsaustralia.org/factsheets/broiler_chickens.php |title=Broiler Chickens Fact Sheet |website=Animals Australia |access-date=August 29, 2010 |archive-url=https://web.archive.org/web/20100712123234/http://www.animalsaustralia.org/factsheets/broiler_chickens.php |archive-date=July 12, 2010 |url-status=live }}</ref> some weeks longer for [[free range]] and [[Organic (food)|organic]] broilers.<ref>{{cite web |title=Chickens Farmed for Meat |url=https://www.ciwf.org.uk/farm-animals/chickens/meat-chickens/ |publisher=[[Compassion in World Farming]] |access-date=February 2, 2024 |archive-date=September 21, 2024 |archive-url=https://web.archive.org/web/20240921105646/https://www.ciwf.org.uk/farm-animals/chickens/meat-chickens/ |url-status=live }}</ref>

[[File:Florida chicken house.jpg|thumb|A commercial chicken house with open sides raising broiler pullets for meat]]

Chickens farmed primarily for eggs are called layer hens. The UK alone consumes more than 34 million eggs per day.<ref>{{Cite web |url=https://www.egginfo.co.uk/egg-facts-and-figures/industry-information/data |title=UK Egg Industry Data |website=Official Egg Info |access-date=April 25, 2017 |archive-url=https://web.archive.org/web/20161230000509/https://www.egginfo.co.uk/egg-facts-and-figures/industry-information/data |archive-date=December 30, 2016 |url-status=live }}</ref> Hens of some breeds can produce over 300 eggs per year; the highest authenticated rate of egg laying is 371 eggs in 364 days.<ref>{{cite book |last1=Glenday |first1=Craig |title=Guinness World Records 2011 |date=April 26, 2011 |publisher=[[Jim Pattison Group]] |isbn=978-0440423102 |page=286}}</ref> After 12 months of laying, the commercial hen's egg-laying ability declines to the point where the flock is commercially unviable. Hens, particularly from [[battery cage]] systems, are sometimes infirm or have lost a significant amount of their feathers, and their life expectancy has been reduced from around seven years to less than two years.<ref name="Browne">{{cite news |url=https://www.theguardian.com/lifeandstyle/2002/mar/10/foodanddrink.features1 |work=The Guardian |location=London |title=Ten weeks to live |first=Anthony |last=Browne |date=March 10, 2002 |access-date=April 28, 2010 |archive-url=https://web.archive.org/web/20080516080228/http://observer.guardian.co.uk/foodmonthly/story/0,,662799,00.html |archive-date=May 16, 2008 |url-status=live }}</ref> In the UK and Europe, laying hens are then slaughtered and used in processed foods, or sold as 'soup hens'.<ref name="Browne" /> In some other countries, flocks are sometimes [[Forced molting|force moulted]] rather than being slaughtered to re-invigorate egg-laying. This involves complete withdrawal of food (and sometimes water) for 7–14 days<ref name="Patwardhan and King, (2011)">{{cite journal |last1=Patwardhan |first1=D. |last2=King |first2=A. |year=2011 |title=Review: feed withdrawal and non feed withdrawal moult |journal=World's Poultry Science Journal |volume=67 |issue=2 |pages=253–268 |doi=10.1017/s0043933911000286|s2cid=88353703 }}</ref> or sufficiently long to cause a body weight loss of 25 to 35%,<ref name="Webster, (2003)">{{cite journal |last1=Webster |first1=A.B. |year=2003 |title=Physiology and behavior of the hen during induced moult |journal=Poultry Science |volume=82 |issue=6 |pages=992–1002 |doi=10.1093/ps/82.6.992 |pmid=12817455|doi-access=free }}</ref> or up to 28 days under experimental conditions.<ref name="Molino et al., (2009)">{{cite journal |last1=Molino |first1=A.B. |last2=Garcia |first2=E.A. |last3=Berto |first3=D.A. |last4=Pelícia |first4=K. |last5=Silva |first5=A.P. |last6=Vercese |first6=F. |year=2009 |title=The Effects of Alternative Forced-Molting Methods on The Performance and Egg Quality of Commercial Layers |journal=Brazilian Journal of Poultry Science |volume=11 |issue=2 |pages=109–113 |doi=10.1590/s1516-635x2009000200006|doi-access=free |hdl=11449/14340 |hdl-access=free }}</ref> This stimulates the hen to lose her feathers but also re-invigorates egg-production. Some flocks may be force-moulted several times. In 2003, more than 75% of all flocks were moulted in the US.<ref name="Yousaf and Chaudhry, (2008)">{{cite journal |last1=Yousaf |first1=M. |last2=Chaudhry |first2=A.S. |title=History, changing scenarios and future strategies to induce moulting in laying hens |journal=World's Poultry Science Journal |date=March 1, 2008 |volume=64 |issue=1 |pages=65–75 |doi=10.1017/s0043933907001729 |s2cid=34761543 |url=http://eprint.ncl.ac.uk/file_store/production/56559/452E6892-26EF-40C6-891B-048E9FE17D2E.pdf |access-date=October 23, 2020 |archive-date=November 24, 2020 |archive-url=https://web.archive.org/web/20201124090812/https://eprint.ncl.ac.uk/file_store/production/56559/452E6892-26EF-40C6-891B-048E9FE17D2E.pdf |url-status=live }}</ref> Chickens are one of the most efficient sources of foods for many different purposes.