Dairy cattle#Reproduction

File:DairyCattle.jpg

Dairy cows may be found either in herds or dairy farms, where dairy farmers own, manage, care for, and collect milk from them, or on commercial farms. Herd sizes vary around the world depending on landholding culture and social structure. The United States has an estimated 9 million cows in around 75,000 dairy herds, with an average herd size of 120 cows. The number of small herds is falling rapidly, with 51% of U.S. milk in 2007 produced by the 3,100 herds with over 500 cows.{{cite report | last1=MacDonald | first1=James M. | last2=O’Donoghue | first2=Erik J. | last3=McBride | first3=William D. | last4=Nehring | first4=Richard F. | last5=Sandretto | first5=Carmen L. | last6=Mosheim | first6=Roberto | date = 4 September 2007 | title = Profits, Costs, and the Changing Structure of Dairy Farming | url = https://www.ers.usda.gov/publications/pub-details/?pubid=45870 | publisher = United States Department of Agriculture | via = Economic Research Service | docket= Economic Research Report Number 47 | access-date = 5 November 2020 | archive-url=https://web.archive.org/web/20201106033335/https://www.ers.usda.gov/webdocs/publications/45868/11138_err47_1_.pdf?v=5344.4 | archive-date=6 November 2020 | url-status = live | df=dmy-all }} The United Kingdom dairy herd overall has nearly 1.5 million cows, with about 100 head reported on an average farm."[http://www.defra.gov.uk/foodfarm/food/industry/sectors/milk/dairyindustry/index.htm Milk and Milk Products, UK Dairy Industry] {{webarchive|url=https://web.archive.org/web/20110115001519/http://www.defra.gov.uk/foodfarm/food/industry/sectors/milk/dairyindustry/index.htm |date=15 January 2011 }}," Department for Environment Food and Rural Affairs 3 September 2010. In New Zealand, the average herd has more than 375 cows, while in Australia, there are approximately 220 cows in the average herd."[http://www.lic.co.nz/pdf/DAIRY%20STATISTICS%2009-10-WEB.pdf New Zealand Dairy Statistics 2009–2010] {{Webarchive|url=https://web.archive.org/web/20110724192833/http://www.lic.co.nz/pdf/DAIRY%20STATISTICS%2009-10-WEB.pdf |date=24 July 2011 }}," Dairy NZ 2010."[http://www.dairyaustralia.com.au/Our-Dairy-Industry/Industry-Statistics.aspx Industry Statistics] {{Webarchive|url=https://web.archive.org/web/20110520041900/http://www.dairyaustralia.com.au/Our-Dairy-Industry/Industry-Statistics.aspx |date=20 May 2011 }}," Dairy Australia. Retrieved 5 January 2011.

The United States dairy herd produced {{convert|185.7|e9lb|e9kg|1|abbr=off|order=flip}} of milk in 2007,{{cite web|author=U.S. Department of Agriculture, National Agriculture Statistics Service |url=http://usda.mannlib.cornell.edu/usda/nass/SB988/sb1022.pdf |title=Milk Cows and Production Estimates 2003–2007|date=March 2009|access-date=30 January 2011}}. up from {{convert|116.6|e9lb|e9kg|1|abbr=off|order=flip}} in 1950,{{cite web |first=Don P. |last=Blaney |url=http://www.ers.usda.gov/media/488847/sb978_1_.pdf |title=The Changing Landscape of U.S. Milk Production |publisher=Statistical Bulletin Number 978, U.S. Department of Agriculture |date=June 2002 |access-date=30 January 2011 |url-status=dead |archive-url=https://web.archive.org/web/20130308102307/http://@ers.usda.gov/media/488847/sb978_1_.pdf |archive-date=8 March 2013 }} yet there were only about 9 million cows on U.S. dairy farms—about 13 million fewer than there were in 1950. The top breed of dairy cow within Canada's national herd category is Holstein, taking up 93% of the dairy cow population, have an annual production rate of {{convert|10257|kg|0|abbr=off}} of milk per cow that contains 3.9% butter fat and 3.2% protein.{{cite web|url=http://www.dairyinfo.gc.ca/index_e.php?s1=dff-fcil&s2=mrr-pcle&s3=dcr-ebl |title=Dairy Animal Registrations – Canadian Dairy Information Centre (CDIC) |author=Government of Canada Canadian Dairy Information Centre |website=www.dairyinfo.gc.ca |access-date=29 January 2018}}

Dairy farming, like many other livestock-rearing methods, can be split into intensive and extensive management systems.{{Cite journal|last=Passetti|display-authors=et al|date=December 2016|title=Intensive dairy farming systems from Holland and Brazil|url=http://www.scielo.br/pdf/asas/v38n4/1807-8672-asas-38-04-00439.pdf|journal=Acta Scientiarum}}

Intensive systems focus towards maximum production per cow in the herd. This involves formulating their diet to provide ideal nutrition and housing the cows in a confinement system such as free stall or tie stall. These cows are housed indoors throughout their lactation and may be put to pasture during their 60-day dry period before ideally calving again. Free stall-style barns involve cattle loosely housed where they can have free access to feed, water, and stalls, but are moved to another part of the barn to be milked multiple times a day. In a tie-stall system, the milking units are brought to the cows during each milking. These cattle are tethered within their stalls with free access to water and feed provided. In extensive systems, cattle are mainly outside on pasture for most of their lives. These cattle are generally lower in milk production and are herded multiple times daily to be milked. The systems used greatly depend on the climate and available land of the region in which the farm is situated.

File:New born Frisian red white calf.jpg

To maintain lactation, a dairy cow must be bred and produce calves.{{Cite web|url=https://www.ciwf.com/farm-animals/cows/dairy-cows/|title=About dairy cows|website=www.ciwf.com|language=en|access-date=6 August 2019}} Depending on market conditions, the cow may be bred with a "dairy bull" or a "beef bull." Female calves (heifers) with dairy breeding may be kept as replacement cows for the dairy herd. If a replacement cow turns out to be a substandard producer of milk, she then goes to market and can be slaughtered for beef. Male calves can either be used later as a breeding bull or sold and used for veal or beef. Dairy farmers usually begin breeding or artificially inseminating heifers around 13 months of age.Department of Animal Science," [http://www.ans.msu.edu/community/facilities/dairy_farm.html Cattle Teaching and Research Center] {{webarchive|url=https://web.archive.org/web/20110516164732/http://www.ans.msu.edu/community/facilities/dairy_farm.html |date=16 May 2011 }}," Michigan State University 4 November 2010. A cow's gestation period is about nine months.Dewey, T. and J. Ng., "[http://animaldiversity.ummz.umich.edu/site/accounts/information/Bos_taurus.html Bos taurus]," Animal Diversity Web, 2001. Retrieved 13 January 2011. Newborn calves are separated from their mothers quickly, usually within three days, as the mother/calf bond intensifies over time and delayed separation can cause extreme stress on both cow and calf.Dale More et al., "[http://vetextension.wsu.edu/documents/CalfEnv1-MaternityPen.pdf Calf Housing and Environments Series]," Veterinary Medicine Extension December 2010. {{webarchive |url=https://web.archive.org/web/20110901053610/http://vetextension.wsu.edu/documents/CalfEnv1-MaternityPen.pdf |date=1 September 2011 }}

Domestic cows can live beyond 20 years; however, those raised for dairy rarely live that long, as the average cow is removed from the dairy herd around age six and marketed for beef.{{cite web |first=Richard L. |last=Wallace |url=http://www.livestocktrail.uiuc.edu/dairynet/paperdisplay.cfm?contentid=354 |title=Market Cows: A Potential Profit Center |publisher=University of Illinois Extension |date=13 March 2002 |access-date=30 January 2011 |archive-date=20 July 2011 |archive-url=https://web.archive.org/web/20110720085303/http://www.livestocktrail.uiuc.edu/dairynet/paperdisplay.cfm?contentid=354 |url-status=dead }} In 2014, roughly 9.5% of the cattle slaughtered in the U.S. were culled dairy cows – cows that can no longer be seen as an economic asset to the dairy farm.{{cite web|author=U.S. Department of Agriculture, National Agriculture Statistics Service |url=http://usda.mannlib.cornell.edu/usda/current/LiveSlauSu/LiveSlauSu-04-27-2015.pdf |title=Livestock Slaughter Annual Summary |date=April 2015 |access-date=24 November 2015 |url-status=dead |archive-url=https://web.archive.org/web/20150912085407/http://usda.mannlib.cornell.edu/usda/current/LiveSlauSu/LiveSlauSu-04-27-2015.pdf |archive-date=12 September 2015 }} These animals may be sold due to reproductive problems or common diseases of milk cows such as mastitis and lameness. A small market exists for slaughter-free milk, which brings increased costs for both consumers and producers.{{Cite web |last= |first= |date=2018-09-20 |title=Former 'Slaughter-Free Dairy' Farmer: No Such Thing As Humane Dairy |url=https://freefromharm.org/animal-farmer-turned-vegan/former-slaughter-free-dairy-farmer-no-such-thing-as-humane-dairy/ |access-date=2025-04-29 |website=Free From Harm |language=en-US}}{{Cite news |date=2017-07-02 |title=New home for 'slaughter-free' Ahimsa dairy farm |url=https://www.bbc.co.uk/news/uk-england-leicestershire-40445883 |access-date=2025-04-29 |work=BBC News |language=en-GB}}{{Cite web |date=2019-11-18 |title=The Dairy Farmer Who Wants to Make Milk for Vegans |url=https://www.vice.com/en/article/the-dairy-farmer-who-wants-to-make-milk-for-vegans-v26n4/ |access-date=2025-04-29 |website=VICE |language=en-US}}

Most heifers (female calves) are kept on farm to be raised as replacement heifers, bred to enter the production cycle. Market calves are generally sold at two weeks of age and bull calves may fetch a premium over heifers due to their size, either current or potential. Calves may be sold for veal, or for one of several types of beef production, depending on available local crops and markets. Such bull calves may be castrated if turnout onto pastures is envisaged, to make them less aggressive. Purebred bulls from elite cows may be put into progeny testing schemes to find out whether they might become superior sires for breeding. Such animals can become extremely valuable.

Most dairy farms separate calves from their mothers within a day of birth to reduce transmission of disease and simplify management of milking cows. Studies have been done allowing calves to remain with their mothers for 1, 4, 7 or 14 days after birth. Cows whose calves were removed longer than one day after birth showed increased searching, sniffing and vocalizations. However, calves allowed to remain with their mothers for longer periods showed weight gains at three times the rate of early removals as well as more searching behavior and better social relationships with other calves.{{cite journal |last1=Flower |first1=Frances C |last2=Weary |first2=Daniel M |title=Effects of early separation on the dairy cow and calf |journal=Applied Animal Behaviour Science |date=January 2001 |volume=70 |issue=4 |pages=275–284 |doi=10.1016/s0168-1591(00)00164-7 |pmid=11179551 }}{{cite journal |last1=Stěhulová |first1=Ilona |last2=Lidfors |first2=Lena |last3=Špinka |first3=Marek |title=Response of dairy cows and calves to early separation: Effect of calf age and visual and auditory contact after separation |journal=Applied Animal Behaviour Science |date=March 2008 |volume=110 |issue=1–2 |pages=144–165 |doi=10.1016/j.applanim.2007.03.028 }}

After separation, some young dairy calves subsist on commercial milk replacer, a feed based on dried milk powder. Milk replacer is an economical alternative to feeding whole milk because it is cheaper, can be bought at varying fat and protein percentages, and is typically less contaminated than whole milk when handled properly. Some farms pasteurize and feed calves milk from the cows in the herd instead of using replacer. A day-old calf consumes around 5 liters of milk per day.{{Cite web|title=Feeding the Newborn Dairy Calf|url=https://extension.psu.edu/feeding-the-newborn-dairy-calf|access-date=23 May 2021|website=Penn State Extension|language=en}}{{citation needed|date=March 2021}}

Cattle are social animals; their ancestors tended to live in matriarchal groups of mothers and offspring. The formation of "friendships" between two cows is common and long lasting. Traditionally individual housing systems were used in calf rearing, to reduce the risk of disease spread and provide specific care. However, due to their social behaviour the grouping of offspring may be better for the calves' overall welfare. Social interaction between the calves can have a positive effect on their growth. It has been seen that calves housed in grouped penning were found to eat more feed than those in single pens,{{cite thesis |last1=Overvest |first1=Morgan |title=Effect of feeding strategy and social housing on behaviour at weaning in dairy calves |date=July 2015 |hdl=10214/9194 |hdl-access=free }} suggesting social facilitation of feeding behaviour in the calves. Play behaviour in pre-weaned dairy calves has also been suggested to help build social skills for later in life. It has been seen that those reared in grouped housing are more likely to become the dominant cattle in a new combination of animals.{{cite journal |last1=Duve |first1=L.R. |last2=Weary |first2=D.M. |last3=Halekoh |first3=U. |last4=Jensen |first4=M.B. |title=The effects of social contact and milk allowance on responses to handling, play, and social behavior in young dairy calves |journal=Journal of Dairy Science |date=November 2012 |volume=95 |issue=11 |pages=6571–6581 |doi=10.3168/jds.2011-5170 |pmid=22939785 |doi-access=free }} These dominant animals have a priority choice of feed or lying areas and are generally stronger animals. For these reasons, it has become common practice to group or pair calves in their housing. It has become common in Canada to see paired or grouped housing in outdoor hutches or in an indoor pack penning.{{Cite web|title=Code of Practice for the Care and Handling of Beef Cattle|url=https://www.nfacc.ca/beef-cattle-code|access-date=23 May 2021|website=www.nfacc.ca}}{{citation needed|date=April 2018}}

A bull calf with high genetic potential may be reared for breeding purposes. It may be kept by a dairy farm as a herd bull, to provide natural breeding for the herd of cows. A bull may service up to 50 or 60 cows during a breeding season. Any more and the sperm count declines, leading to cows "returning to service" (needing to be bred again). A herd bull may only stay for one season, as when most bulls reach over two years old their temperament becomes too unpredictable.

Bull calves intended for breeding are commonly bred on specialized dairy breeding farms, not production farms. These farms are the major source of stocks for artificial insemination.

{{see also|Sexing}}

File:Boskapsskötsel i ladugården. Mangskogs socken, Värmland, 1911 - Nordiska Museet - NMA.0043102.jpg

The dairy cow produces large amounts of milk in its lifetime. Production levels peak at around 40 to 60 days after calving. Production declines steadily afterwards until milking is stopped at about 10 months. The cow is "dried off" for about sixty days before calving again. Within a 12 to 14-month inter-calving cycle, the milking period is about 305 days or 10 months long.{{cite web |first=Mike |last=Hutjens |url=http://www.livestocktrail.uiuc.edu/dairynet/paperDisplay.cfm?ContentID=548 |title=Managing the Transition Cow |publisher=University of Illinois Extension |date=24 February 1999 |access-date=30 January 2011 |archive-date=13 January 2011 |archive-url=https://web.archive.org/web/20110113200427/http://www.livestocktrail.uiuc.edu/dairynet/paperDisplay.cfm?ContentID=548 |url-status=dead }}{{cite web|title=Life Cycle and Lactation Cycle of Dairy Cows: Life Cycle of Typical Milk Producing Dairy Cow|url=http://vetstudentresearch.blogspot.co.il/2015/06/life-cycle-and-lactation-cycle-of-dairy.html|website=VET IN TRAINING – Veterinary Disease Information Blog|access-date=25 April 2017}}{{cite web|last1=Moran|first1=John|title=Managing Cow Lactation Cycles|url=http://www.thecattlesite.com/articles/4248/managing-cow-lactation-cycles/|website=The Cattle Site|access-date=25 April 2017|date=18 May 2015}} Among many variables, certain breeds produce more milk than others within a range of around {{convert|6800|to|17000|kg|lb|abbr=on}} of milk per year.{{Cite web|title=What Causes a Cow to Stop Producing Milk / 8 Videos – Farm Animal Report|url=https://www.farmanimalreport.com/2020/07/17/what-causes-a-cow-to-stop-producing-milk-8-videos/|access-date=22 May 2021|website=www.farmanimalreport.com|date=17 July 2020 |language=en-us}}{{Citation needed|date=May 2017}}

The Holstein Friesian is the main breed of dairy cattle in Australia, and said to have the "world's highest" productivity, at {{convert|10000|L}} of milk per year.[http://www.austrex.com.au/livestock/dairy-cattle/holstein/ 'Holstein' (AUSTREX website)] {{Webarchive|url=https://web.archive.org/web/20161030143722/http://www.austrex.com.au/livestock/dairy-cattle/holstein/ |date=30 October 2016 }}. Accessed 30 October 2016. The average for a single dairy cow in the US in 2007 was {{convert|20,204|lb|kg|abbr=on|order=flip }} per year, excluding milk consumed by her calves, whereas the same average value for a single cow in Israel was reported in the Philippine press to be {{convert|12240|kg|lb|abbr=on}} in 2009.{{Cite web|url=http://www.mb.com.ph/articles/345061/12000-liters-milk-cow|archiveurl=https://web.archive.org/web/20120206130355/http://www.mb.com.ph/articles/345061/12000-liters-milk-cow|url-status=dead|title=12,000 liters milk per cow!, 2009|website=Manila Bulletin |archivedate=6 February 2012}} High production cows are more difficult to breed at a two-year interval. Many farms take the view that 24 or even 36 month cycles are more appropriate for this type of cow.{{Cite web|title=Genetic characterization of indigenous cattle breeds in Zambia – which way forward? – Stories, NAFA|url=http://www-naweb.iaea.org/nafa/news/2011-zambia-cattle-breeds.html|access-date=22 May 2021|website=www-naweb.iaea.org}}{{Cite web|title=Farm structures ... – Ch10 Animal housing: Cattle housing|url=http://www.fao.org/3/s1250e/S1250E11.htm|access-date=22 May 2021|website=www.fao.org}}

Dairy cows may continue to be economically productive for many lactation cycles. In theory a longevity of 10 lactations is possible. The chances of problems arising which may lead to a cow being culled are high, however; the average herd life of US Holstein is today fewer than 3 lactations. This requires more herd replacements to be reared or purchased. Over 90% of all cows are slaughtered for 4 main reasons:

• Infertility – failure to conceive and reduced milk production.

:Cows are at their most fertile between 60 and 80 days after calving. Cows remaining "open" (not with calf) after this period become increasingly difficult to breed, which may be due to poor health. Failure to expel the afterbirth from a previous pregnancy, luteal cysts, or metritis, an infection of the uterus, are common causes of infertility

• Mastitis – a persistent and potentially fatal mammary gland infection, leading to high somatic cell counts and loss of production.

:Mastitis is recognized by a reddening and swelling of the infected quarter of the udder and the presence of whitish clots or pus in the milk. Treatment is possible with long-acting antibiotics but milk from such cows is not marketable until drug residues have left the cow's system, also called withdrawal period.

• Lameness – persistent foot infection or leg problems causing infertility and loss of production.

:High feed levels of highly digestible carbohydrate cause acidic conditions in the cow's rumen. This leads to laminitis and subsequent lameness, leaving the cow vulnerable to other foot infections and problems which may be exacerbated by standing in faeces or water soaked areas.

• Production – some animals fail to produce economic levels of milk to justify their feed costs.

:Production below {{convert|12|to|15|L|abbr=on}} of milk per day is not economically viable.{{Cite web|last=PubChem|title=Benzene|url=https://pubchem.ncbi.nlm.nih.gov/compound/241|access-date=22 May 2021|website=pubchem.ncbi.nlm.nih.gov|language=en}}{{Failed verification|date=August 2021}}{{citation needed|date=January 2015}}

Cow longevity is strongly correlated with production levels.{{cite journal |last1=Knaus |first1=Wilhelm |title=Dairy cows trapped between performance demands and adaptability |journal=Journal of the Science of Food and Agriculture |date=May 2009 |volume=89 |issue=7 |pages=1107–1114 |doi=10.1002/jsfa.3575 |bibcode=2009JSFA...89.1107K }} Lower production cows live longer than high production cows, but may be less profitable. Cows no longer wanted for milk production are sent to slaughter. Their meat is of relatively low value and is generally used for processed meat. Another factor affecting milk production is the stress the cow is faced with. Psychologists at the University of Leicester, UK, analyzed the musical preference of milk cows and found out that music actually influences the dairy cow's lactation. Calming music can improve milk yield, probably because it reduces stress and relaxes the cows in much the same way as it relaxes humans.

Certain behaviors such as eating, ruminating, and lying down can be related to the health of the cow and cow comfort. These behaviors can also be related to the productivity of the cows. Likewise, stress, disease, and discomfort negatively affect milk productivity. Therefore, it can be said that it is in the best interest of the farmer to increase eating, rumination, and lying down and decrease stress, disease, and discomfort to achieve the maximum productivity possible.{{cite journal |last1=Vanhoudt |first1=Arne |last2=van Winden |first2=Steven |last3=Fishwick |first3=John C. |last4=Bell |first4=Nicholas J. |title=Monitoring cow comfort and rumen health indices in a cubicle-housed herd with an automatic milking system: a repeated measures approach |journal=Irish Veterinary Journal |date=December 2015 |volume=68 |issue=1 |pages=12 |doi=10.1186/s13620-015-0040-7 |pmid=26075057 |pmc=4465732 |doi-access=free }} Also, estrous behaviors such as mounting can be a sign of cow comfort, because if a cow is lame, nutritionally deficient, or housed in an overcrowded barn, its estrous behaviors are altered.{{cite web |last1=O'Connor |first1=Michael L |title=Heat Detection and Timing of Insemination for Cattle |date=17 May 2016 |url=https://extension.psu.edu/heat-detection-and-timing-of-insemination-for-cattle |access-date=3 April 2018 |archive-date=30 August 2018 |archive-url=https://web.archive.org/web/20180830005118/https://extension.psu.edu/heat-detection-and-timing-of-insemination-for-cattle |url-status=dead }}

Feeding behaviors are important for the dairy cow, as feeding is how the cow ingests dry matter. However, the cow must ruminate to fully digest the feed and utilize the nutrients in the feed.{{cite journal |last1=Cooper |first1=M.D. |last2=Arney |first2=D.R. |last3=Phillips |first3=C.J.C. |title=Two- or Four-Hour Lying Deprivation on the Behavior of Lactating Dairy Cows |journal=Journal of Dairy Science |date=March 2007 |volume=90 |issue=3 |pages=1149–1158 |doi=10.3168/jds.S0022-0302(07)71601-6 |pmid=17297089 |doi-access=free }} Dairy cows with good rumen health are likely to be more profitable than cows with poor rumen health—as a healthy rumen aids in digestion of nutrients. An increase in the time a cow spends ruminating is associated with the increase in health and an increase in milk production. The productivity of dairy cattle is most efficient when the cattle have a full rumen.{{cite journal |last1=Lindström |first1=Tina |last2=Redbo |first2=Ingrid |title=Effect of feeding duration and rumen fill on behaviour in dairy cows |journal=Applied Animal Behaviour Science |date=December 2000 |volume=70 |issue=2 |pages=83–97 |doi=10.1016/s0168-1591(00)00148-9 |pmid=11080553 }} Also, the standing action while feeding after milking has been suggested to enhance udder health. The delivery of fresh feed while the cattle are away for milking stimulates the cattle to feed upon return, potentially reducing the prevalence of mastitis as the sphincters have time to close while standing.{{cite journal |last1=DeVries |first1=T.J. |last2=von Keyserlingk |first2=M.A.G. |title=Time of Feed Delivery Affects the Feeding and Lying Patterns of Dairy Cows |journal=Journal of Dairy Science |date=February 2005 |volume=88 |issue=2 |pages=625–631 |doi=10.3168/jds.S0022-0302(05)72726-0 |pmid=15653529 |doi-access=free }} This makes the pattern of feeding directly after being milked an ideal method of increasing the efficiency of the herd.

Cows have a high motivation to lie down. They should lie down for at least five to six hours after every meal to ruminate well.{{r|tweti20021026}} When the lactating dairy cow lies down, blood flow is increased to the mammary gland which in return results in a higher milk yield.{{cite journal |last1=Haley |first1=D.B |last2=de Passillé |first2=A.M |last3=Rushen |first3=J |title=Assessing cow comfort: effects of two floor types and two tie stall designs on the behaviour of lactating dairy cows |journal=Applied Animal Behaviour Science |date=February 2001 |volume=71 |issue=2 |pages=105–117 |doi=10.1016/s0168-1591(00)00175-1 |pmid=11179563 }} When they stand too long, cows become stressed, lose weight, get sore feet, and produce less milk.{{r|tweti20021026}}

To ensure that the dairy cows lie down as much as needed, the stalls must be comfortable.{{r|tweti20021026}} A stall should have a rubber mat and bedding, and be large enough for the cow to lie down and get up comfortably. Signs that the stalls may not be comfortable enough for the cows are the cows are standing, either ruminating or not, instead of lying down, or perching, which is when the cow has its front end in the stall and their back end out of the stall.Anderson, 2014. Dairy Cow Comfort – Free-stall Dimensions.{{vs|date=August 2024}} Dried manure, almond shells, straw, sand, or waterbeds are used for cow bedding.{{Cite news |last=Tweti |first=Mira |date=26 October 2002 |title=Water Beds for Cattle? These Cows Milk It for All It's Worth |language=en-US |work=Los Angeles Times |url=https://www.latimes.com/archives/la-xpm-2002-oct-26-me-outthere26-story.html |access-date=26 May 2021}}

There are two types of housing systems in dairy production, free style housing and tie stall. Free style housing is where the cow is free to walk around and interact with its environment and other members of the herd. Tie stall housing is when the cow is chained to a stanchion stall with the milking units and feed coming to them.{{cite web|url=http://dairyinfo.gc.ca/index_e.php?s1=dff-fcil&s2=farm-ferme&s3=db-el|title=Types of Dairy Barns – Canadian Dairy Information Centre (CDIC) |author=Government of Canada Canadian Dairy Information Centre |website=dairyinfo.gc.ca|access-date=29 January 2018}}

Artificial light and daylight inlets have an impact on milk production and cow behavior.{{Cite journal |last1=Dahl |first1=G.E. |last2=Buchanan |first2=B.A. |last3=Tucker |first3=H.A. |date=April 2000 |title=Photoperiodic Effects on Dairy Cattle: A Review |journal=Journal of Dairy Science |volume=83 |issue=4 |pages=885–893 |doi=10.3168/jds.s0022-0302(00)74952-6 |pmid=10791806 |doi-access=free }} For cows in lactation a light program of 16 hours light and 8 hours of darkness is recommended,{{Cite journal |last1=Dahl |first1=G. E. |last2=Elsasser |first2=T. H. |last3=Capuco |first3=A. V. |last4=Erdman |first4=R. A. |last5=Peters |first5=R. R. |date=1997-11-01 |title=Effects of a Long Daily Photoperiod on Milk Yield and Circulating Concentrations of Insulin-Like Growth Factor-I1 |journal=Journal of Dairy Science |volume=80 |issue=11 |pages=2784–2789 |doi=10.3168/jds.S0022-0302(97)76241-6 |pmid=9406069 |doi-access=free }} while for non-lactating pregnant cows 8 hours of light and 16 hours of darkness seem to be a better fit.{{cite journal |last1=Miller |first1=A.R.E. |last2=Erdman |first2=R.A. |last3=Douglass |first3=L.W. |last4=Dahl |first4=G.E. |title=Effects of Photoperiodic Manipulation During the Dry Period of Dairy Cows |journal=Journal of Dairy Science |date=May 2000 |volume=83 |issue=5 |pages=962–967 |doi=10.3168/jds.S0022-0302(00)74960-5 |pmid=10821571 |doi-access=free }}

Pasteurization is the process of heating milk to a high enough temperature for a short period of time to kill the microbes in the milk and increase keep time and decrease spoilage time. By killing the microbes, decreasing the transmission of infection, and elimination of enzymes the quality of the milk and the shelf life increases. Pasteurization is either completed at {{convert|63|C|F}} for thirty minutes or a flash pasteurization is completed for 15 seconds at {{convert|72|C|F}}.{{Cite web|url=http://www.milkfacts.info/Milk%20Microbiology/Milk%20Microbiology%20Page.htm|title=Milk Microbiology | MilkFacts.info}} By-products of milk include butterfat, cream, curds, and whey. Butterfat is the main lipid in milk. The cream contains 18–40% butterfat. The industry can be divided into 2 market territories; fluid milk and industrialized milk such as yogurt, cheeses, and ice cream.{{cite web|url=http://dairyinfo.gc.ca/index_e.php?s1=dff-fcil|title=Dairy Facts and Figures – Canadian Dairy Information Centre (CDIC) |author=Government of Canada Canadian Dairy Information Centre |website=dairyinfo.gc.ca|access-date=29 January 2018}}

Whey protein makes up about 20% of milk's protein composition and is separated from the casein (80% of milk's protein make up) during the process of curdling cheese. This protein is commonly used in protein bars, beverages and concentrated powder, due to its high quality amino acid profile. It contains levels of both essential amino acids as well as branched that are above those of soy, meat, and wheat.{{cite journal |last1=Gangurde |first1=HemantH |last2=Patil |first2=PoojaS |last3=Chordiya |first3=MayurA |last4=Baste |first4=NayanaS |title=Whey protein |journal=Scholars' Research Journal |date=2011 |volume=1 |issue=2 |pages=69 |doi=10.4103/2249-5975.99663 |doi-access=free }} "Diafiltered" milk is a process of ultrafiltration of the fluid milk to separate lactose and water from the casein and whey proteins. This process allows for more efficiency in cheese making and gives the potential to produce low-carb dairy products.{{Cite news|url=http://www.dpac-atlc.ca/what-is-dairy-processing/frequently-asked-questions/#standards-identity-dairy-products|title=FAQs{{!}} DPAC-ATLC|work=Dairy Processors Association of Canada|access-date=3 April 2018|language=en-US}}

File:Inseminace krav.jpg.]]

Since the 1950s, artificial insemination (AI) is used at most dairy farms; these farms may keep no bull. Artificial insemination uses estrus synchronization to indicate when the cow is going through ovulation and is susceptible to fertilization. Advantages of using AI include its low cost and ease compared to maintaining a bull, ability to select from a large number of bulls, elimination of diseases in the dairy industry, improved genetics and improved animal welfare.{{fact|date=August 2024}} Rather than a large bull jumping on a smaller heifer or weaker cow, AI allows the farmer to complete the breeding procedure within 5 minutes with minimum stress placed on the individual female's body.{{Cite web|title=Livestock:: Cattle:: Artificial InseminationAnimal Husbandry :: Home|url=https://agritech.tnau.ac.in/animal_husbandry/animhus_cattle_AI.html|access-date=22 May 2021|website=agritech.tnau.ac.in}}

Dairy cattle are polyestrous, meaning they cycle continuously throughout the year. They tend to be on a 21 day estrus cycle. However for management purposes, some operations use synthetic hormones to synchronize their cows or heifers to have them breed and calve at the ideal times. These hormones are short term and only used when necessary. For example, one common protocol for synchronization involves an injection of GnRH (gonadotrophin releasing hormone). which increases the levels of follicle stimulating hormone and luteinizing hormone in the body. Then, seven days later prostaglandin F2-alpha is injected, followed by another GnRH injection 48 hours later. This protocol causes the animal to ovulate 24 hours later.{{Cite web|url=https://extension.msstate.edu/sites/default/files/publications/publications/p2807.pdf|title=Estrus Synchronization of Dairy Cattle|access-date=28 March 2018}}

Estrus is often called standing heat in cattle and refers to the time in their cycle where the female is receptive towards the male. Estrus behaviour can be detected by an experienced stockman. These behaviours can include standing to be mounted, mounting other cows, restlessness, decreased milk production, and decreased feed intake.{{Cite web|url=https://extension.psu.edu/heat-detection-and-timing-of-insemination-for-cattle|title=Heat Detection and Timing of Insemination for Cattle|website=Penn State Extension|access-date=3 April 2018|archive-date=30 August 2018|archive-url=https://web.archive.org/web/20180830005118/https://extension.psu.edu/heat-detection-and-timing-of-insemination-for-cattle|url-status=dead}}

More recently, embryo transfer has been used to enable the multiplication of progeny from elite cows. Such cows are given hormone treatments to produce multiple embryos. These are then 'flushed' from the cow's uterus. 7–12 embryos are consequently removed from these donor cows and transferred into other cows who serve as surrogate mothers. This results in between three and six calves instead of the normal single or (rarely) twins.

As a result of long-term cooperation between USDA and dairy farmers which led to a revolution in dairy cattle productivity, the United States has since 1992 been the world’s largest supplier of dairy bull semen.{{cite web |url=https://worksinprogress.co/issue/how-big-data-created-the-modern-dairy-cow/ |title=How big data created the modern dairy cow |date=December 5, 2024 |access-date=December 6, 2024 |first=Jared |last=Hutchens |work=Works In Progress |archive-url=https://archive.today/20241206185854/https://worksinprogress.co/issue/how-big-data-created-the-modern-dairy-cow/ |archive-date=December 6, 2024}}

Farmers in some countries sometimes administer hormone treatments to dairy cows to increase milk production and reproduction.

About 17% of dairy cows in the United States are injected with Bovine somatotropin, also called recombinant bovine somatotropin (rBST), recombinant bovine growth hormone (rBGH), or artificial growth hormone.{{cite web |url=http://www.aphis.usda.gov/vs/ceah/ncahs/nahms/dairy/dairy07/Dairy2007_PartII.pdf |title=Dairy 2007 Part II: Changes in the U.S. Dairy Cattle Industry, 1991–2007 |date=March 2007 |publisher=Animal and Plant Health Inspection Service |access-date=27 January 2010 |url-status=dead |archive-url=https://web.archive.org/web/20100113172353/http://www.aphis.usda.gov/vs/ceah/ncahs/nahms/dairy/dairy07/Dairy2007_PartII.pdf |archive-date=13 January 2010 }} The use of this hormone increases milk production by 11%–25%.{{citation needed|date=April 2022}} The U.S. Food and Drug Administration (FDA) has ruled that rBST recombinant bovine somatotropin (rBST), recombinant bovine growth hormone (rBGH) is harmless to people, while the American Cancer Society finds that the use of rBGH can cause adverse health effects in cows. Though the evidence for potential harm to humans is inconclusive and would require more research.{{cite journal |last1=Collier |first1=R. J. |last2=Bauman |first2=D. E. |title=Update on human health concerns of recombinant bovine somatotropin use in dairy cows |journal=Journal of Animal Science |date=April 2014 |volume=92 |issue=4 |pages=1800–1807 |doi=10.2527/jas.2013-7383 |pmid=24663163 }}{{Cite web |title=Recombinant Bovine Growth Hormone |url=https://www.cancer.org/cancer/risk-prevention/chemicals/recombinant-bovine-growth-hormone.html |access-date=2024-05-21 |website=www.cancer.org |language=en}} The use of rBST is banned in Canada, parts of the European Union, as well as Australia and New Zealand due to possible opposing views and of lack of findings.{{cite journal |last1=Brinckman |first1=Dirk |title=The regulation of rbST: the European case |journal=AgBioForum |date=2000 |volume=3 |issue=2&3 |pages=164–172 |hdl=10355/1159 }}{{Cite web |date=2024-01-23 |title=Why is the artificial growth hormone rbST banned in Canada? {{!}} Canadian Goodness |url=https://dairyfarmersofcanada.ca/en/canadian-goodness/ask-dairy-experts/why-artificial-growth-hormone-rbst-banned-canada |access-date=2024-05-21 |website=dairyfarmersofcanada.ca |language=en}}{{Cite web |title=rBGH: What the Research Shows |url=https://www.foodandwatereurope.org/factsheet/what-research-shows/ |access-date=2024-05-21 |website=Food & Water Action Europe |language=en-US}}{{Cite web |date=March 15–16, 1999 |title=Report on Public Health Aspects of the Use of Bovine Somatotrophin |url=https://food.ec.europa.eu/system/files/2020-12/sci-com_scv_out19_en.pdf |access-date=May 21, 2024 |website=food.ec.europa.eu}}

In the United States the Pasteurized Milk Ordinance requires a milk sample is taken from every farm and from every load of milk delivered to a processing plant.https://www.fda.gov/media/114169/download {{Bare URL PDF|date=March 2022}} These samples are then tested for antibiotic and any milk testing positive is discarded and farm identified. Traceback to the dairy is undertaken by the FDA with further consequences including the possibility revocation of ability to sell milk.{{Cite journal|last=Nutrition|first=Center for Food Safety and Applied|date=8 April 2020|title=National Drug Residue Milk Monitoring Program|url=https://www.fda.gov/food/food-compliance-programs/national-drug-residue-milk-monitoring-program|journal=FDA|language=en}}

Nutrition plays an important role in keeping cattle healthy and strong. Implementing an adequate nutrition program can also improve milk production and reproductive performance. Nutrient requirements may not be the same depending on the animal's age and stage of production. Diets are formulated to meet the dairy cow's energy and amino acid requirements for lactation, growth, and/or reproduction.{{Cite web|url=https://extension.umn.edu/dairy-milking-cows/formulating-dairy-cow-rations|title=Formulating dairy cow rations|website=extension.umn.edu}}

Forages, which refer especially to anything grown in the field such as hay, straw, corn silage, or grass silage, are the most common type of feed used. The base of most lactating dairy cattle diets is high quality forage. Cereal grains, as the main contributors of starch to diets, are important in helping to meet the energy needs of dairy cattle. Barley is an excellent source of balanced amounts of protein, energy, and fiber.{{cite web|url=http://www.ag.ndsu.edu/pubs/ansci/dairy/eb72w.htm|title=Feeding Barley to Dairy Cattle|access-date=2 June 2010|archive-date=2 April 2012|archive-url=https://web.archive.org/web/20120402235743/http://www.ag.ndsu.edu/pubs/ansci/dairy/eb72w.htm|url-status=dead}}

Ensuring adequate body fat reserves is essential for cattle to produce milk and also to keep reproductive efficiency. However, if cattle get excessively fat or too thin, they run the risk of developing metabolic problems and may have problems with calving.{{cite web|url=http://extension.missouri.edu/publications/DisplayPub.aspx?P=G3170|title=Feeding Dairy Cattle for Proper Body Condition Score|access-date=2 June 2010|archive-date=20 March 2011|archive-url=https://web.archive.org/web/20110320135317/http://extension.missouri.edu/publications/DisplayPub.aspx?P=G3170|url-status=dead}} Scientists have found that a variety of fat supplements can benefit conception rates of lactating dairy cows. Some of these different fats include oleic acids, found in canola oil, animal tallow, and yellow grease; palmitic acid found in granular fats and dry fats; and linolenic acids which are found in cottonseed, safflower, sunflower, and soybean.{{cite web|url=http://www.extension.org/pages/Lipids_and_Longevity|title=Fats Defined|access-date=2 June 2010|archive-date=5 June 2010|archive-url=https://web.archive.org/web/20100605073726/http://www.extension.org/pages/Lipids_and_Longevity|url-status=dead}}

Diets may additionally be formulated to strategically reduce methane emissions. Ruminants such as the cow have microbes in their rumen called methanogens which are capable of digesting down plant material so it can be utilized for energy, but also generates methane as a byproduct which is then released into the atmosphere by belching.

{{See also|List of dairy cattle breeds}}

File:Jersey dairy cattle nearbieihokkaido-2022-08-11.webm, Japan]]

File:Braunvieh am Simplonpass, Schweiz.jpg in the Alps]]

According to the Purebred Dairy Cattle Association, PDCA, there are 7 major dairy breeds in the United States. These are: Holstein Black/White and Red/White, Brown Swiss, Guernsey, Ayrshire, Jersey, and Milking Shorthorn.{{Cite web|url = http://www.purebreddairycattle.com/|title = Purebred Dairy Cattle Association|access-date = 17 September 2014|website = Purebred Dairy Cattle Association}}

Holstein cows originate from the Netherlands and have distinct black and white or more rarely red and white markings. Holstein cows are the biggest of all dairy breeds. A full mature Holstein cow usually weighs around {{convert|1500|lb|-2|order=flip}} and is {{convert|58|in|cm|0|order=flip}} tall at the shoulder. They are known for their outstanding milk production among the main breeds of dairy cattle. An average Holstein cow produces around {{convert|23000|lb|-3|order=flip}} of milk each lactation. Of the 9 million dairy cows in the U.S., approximately 90% of them are of the Holstein descent.{{Cite web|url = http://www.holsteinusa.com/pdf/fact_sheet_cattle.pdf|title = Facts about Holstein Cattle|publisher = Holstein Association USA}} The top breed of dairy cow within Canada's national herd category is Holstein, taking up 93% of the dairy cow population, have a production rate of {{convert|10257|kg|0}} of milk per cow that contains 3.9% butter fat and 3.2% protein

Brown Swiss cows are widely accepted as the oldest dairy cattle breed, originally coming from a part of northeastern Switzerland. Some experts think that the modern Brown Swiss skeleton is similar to one found that looks to be from around the year 4000 BC Also, there is evidence that monks started breeding these cows about 1000 years ago.{{Cite web|title = Breeds – Brown Swiss|url = http://www.thecattlesite.com/breeds/dairy/31/brown-swiss/overview/|website = The Cattle Site|access-date = 9 February 2016|archive-date = 16 February 2016|archive-url = https://web.archive.org/web/20160216152125/http://www.thecattlesite.com/breeds/dairy/31/brown-swiss/overview/|url-status = dead}}

The Ayrshire breed first originated in the County of Ayr in Scotland. It became regarded as a well established breed in 1812. The different breeds that were crossed to form the Ayrshire are not exactly known. However, there is evidence that several breeds were crossed with the native cattle to create the breed.{{Cite web|title = Breeds – Ayrshire|url = http://www.thecattlesite.com/breeds/dairy/19/ayrshire/overview/|website = The Cattle Site|access-date = 9 February 2016|archive-date = 16 February 2016|archive-url = https://web.archive.org/web/20160216153851/http://www.thecattlesite.com/breeds/dairy/19/ayrshire/overview/|url-status = dead}}

Guernsey cows originated just off the coast of France on the small Isle of Guernsey. The breed was first known as a separate breed around 1700. Guernseys are known for their ability to produce very high quality milk from grass. Also, the term "Golden Guernsey" is very common as Guernsey cattle produce rich, yellow milk rather than the standard white milk other cow breeds produce.{{Cite web|title = Breeds – Guernsey|url = http://www.thecattlesite.com/breeds/dairy/21/guernsey/overview/|website = The Cattle Site|access-date = 9 February 2016|archive-date = 16 February 2016|archive-url = https://web.archive.org/web/20160216152239/http://www.thecattlesite.com/breeds/dairy/21/guernsey/overview/|url-status = dead}}

The Jersey originates on the island of Jersey in the Channel Islands. Cows usually weigh some {{convert|350|-|400|kg|abbr=on|-2|comma=off}}. The milk is rich and has a yellowish tinge; the fat content may exceed 6%.{{r|cabi|p=212}} American Jerseys have been selectively bred for higher milk yield, and are often larger and coarser than the island stock.{{r|cabi|p=212}}

File:Mobiler Melkstand mit Futtertrögen, DeLaval.jpg cattle]]

Animal welfare refers to both the physical and mental state of an animal, and how it is coping with its situation. An animal is considered in a good state of welfare if it is able to express its innate behaviour, comfortable, healthy, safe, well nourished, and is not suffering from harmful states such as distress, fear and pain. Good animal welfare requires disease prevention and veterinary treatment, appropriate shelter, management, nutrition, and humane handling. If the animal is slaughtered then it is no longer "good animal welfare".{{cite book |title=Cow Talk |url=http://www.publish.csiro.au/nid/20/pid/7274.htm |author1=Moran, John |author2=Doyle, Rebecca |publisher=CSIRO Publishing |year=2015 |isbn=9781486301614}} It is the human responsibility of the animals' wellbeing in all husbandry and management practices including humane euthanasia.

Proper animal handling, or stockmanship, is crucial to dairy animals' welfare as well as the safety of their handlers. Improper handling techniques can stress cattle leading to impaired production and health, such as increased slipping injuries. Additionally, the majority of nonfatal worker injuries on a dairy farm are from interactions with cattle. Dairy animals are handled on a daily basis for a wide variety of purposes including health-related management practices and movement from freestalls to the milking parlor. Due to the prevalence of human-animal interactions on dairy farms, researchers, veterinarians, and farmers alike have focused on furthering our understanding of stockmanship and educating agriculture workers. Stockmanship is a complex concept that involves the timing, positioning, speed, direction of movement, and sounds and touch of the handler.{{Cite web|last=Anonymous|title=Dairy Cattle management I Mshindo media|url=https://www.mshindoveterinarycentre.com/2019/06/dairy-cattle-management-i-mshindo-media.html|access-date=23 May 2021|archive-date=23 May 2021|archive-url=https://web.archive.org/web/20210523085911/https://www.mshindoveterinarycentre.com/2019/06/dairy-cattle-management-i-mshindo-media.html|url-status=dead}}{{citation needed|date=April 2018}}

A recent survey of Minnesota dairy farms revealed that 42.6% of workers learned stockmanship techniques from family members, and 29.9% had participated in stockmanship training. However, as the growing U.S. dairy industry increasingly relies on an immigrant workforce, stockmanship training and education resources become more pertinent. Clearly communicating and managing a large culturally diverse workforce brings new challenges such as language barriers and time limitations.{{cite journal |last1=Sorge |first1=U.S. |last2=Cherry |first2=C. |last3=Bender |first3=J.B. |title=Perception of the importance of human-animal interactions on cattle flow and worker safety on Minnesota dairy farms |journal=Journal of Dairy Science |date=July 2014 |volume=97 |issue=7 |pages=4632–4638 |doi=10.3168/jds.2014-7971 |pmid=24835968 |doi-access=free }}

Organizations like the Upper Midwest Agriculture Safety and Health Center offer resources such as bilingual training videos, fact sheets, and informational posters for dairy worker training. Additionally the Beef Quality Assurance Program offer seminars, live demonstrations, and online resources for stockmanship training.{{Cite web|title=Beef Quality Assurance – BQA – Online Certifications|url=https://www.bqa.org/beef-quality-assurance-certification/online-certifications|access-date=22 May 2021|website=Beef Quality Assurance – BQA|language=en}}{{citation needed|date=March 2021}}

For cows to reach high performance in milk yields and reproduction, they must be in great condition and comfortable in the system. Once an individual's welfare is reduced, so does her efficiency and production. This creates more cost and time on the operation, therefore most farmers strive to create a healthy, hygienic, atmosphere for their cattle. As well as provide quality nutrition that keep the cows yield high.{{cite journal |last1=Fregonesi |first1=Jose A |last2=Leaver |first2=J.David |title=Behaviour, performance and health indicators of welfare for dairy cows housed in strawyard or cubicle systems |journal=Livestock Production Science |date=March 2001 |volume=68 |issue=2–3 |pages=205–216 |doi=10.1016/S0301-6226(00)00234-7 }}

The production of milk requires that the cow be in lactation, which is a result of the cow having given birth to a calf. The cycle of insemination, pregnancy, parturition, and lactation is followed by a "dry" period of about two months before calving, which allows udder tissue to regenerate. A dry period that falls outside this time frames can result in decreased milk production in subsequent lactation.{{cite journal |last1=Bachman |first1=K.C. |last2=Schairer |first2=M.L. |title=Invited Review: Bovine Studies on Optimal Lengths of Dry Periods |journal=Journal of Dairy Science |date=October 2003 |volume=86 |issue=10 |pages=3027–3037 |doi=10.3168/jds.S0022-0302(03)73902-2 |pmid=14594219 |doi-access=free }} Dairy operations therefore include both the production of milk and the production of calves. Bull calves are either castrated and raised as steers for beef production or used for veal.

The practice of dairy production has been criticized by animal rights proponents. Some of the ethical reasons regarding dairy production cited include how often the dairy cattle are impregnated needed to produce milk, the separation of calves from their mothers to obtain the milk meant for their calves and the fact that dairy cows are considered "spent" and culled at a relatively young age, another reason is that most male calves are of no use to the dairy industry and are sold for beef or veal, as well as environmental concerns regarding any cattle production.{{Citation|last=Doggett|first=Tyler|title=Moral Vegetarianism|date=2018|url=https://plato.stanford.edu/archives/fall2018/entries/vegetarianism/#Dair|encyclopedia=The Stanford Encyclopedia of Philosophy|editor-last=Zalta|editor-first=Edward N.|edition=Fall 2018|publisher=Metaphysics Research Lab, Stanford University|access-date=22 May 2021}}

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{{reflist|refs=

Valerie Porter, Lawrence Alderson, Stephen J.G. Hall, D. Phillip Sponenberg (2016). [https://books.google.com/books?id=2UEJDAAAQBAJ Mason's World Encyclopedia of Livestock Breeds and Breeding] (sixth edition). Wallingford: CABI. {{ISBN|9781780647944}}.

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Category:Dairy farming

Category:Cows

Category:Milk