Oophorectomy

Oophorectomy is the surgical removal of the ovaries of a female animal. In the case of non-human animals, this is also called spaying. It is a form of sterilization.

The removal of the ovaries together with the Fallopian tubes is called salpingo-oophorectomy. Oophorectomy and salpingo-oophorectomy are not common forms of birth control in humans; more usual is tubal ligation, in which the Fallopian tubes are blocked but the ovaries remain intact.

In humans, oophorectomy is most usually performed together with a hysterectomy - the removal of the uterus. Its use in a hysterectomy when there are no other health problems is somewhat controversial.

In animals, spaying involves an invasive removal of the ovaries, but rarely has major complications; the superstition that it causes weight gain is not based on fact. Spaying is especially important for certain animals that require the ovum to be released at a certain interval (called estrus or "heat"), such as cats and dogs. If the cell is not released during these animal's heat, it can cause severe medical problems that can be averted by spaying or partnering the animal with a male.

Oophorectomy is sometimes referred to as castration, but that term is most often used to mean the removal of a male animal's testicles.

See also


Zoo

A zoological garden, or zoo for short, is a place where wild animals are encaged in an artificial environment and exhibited to the public.

The first zoos were private menageries, usually belonging to kings. The first public zoological garden was created in Vienna in 1752, when the Habsburg Emperors decided to grant public access to the former privately owned Schönbrunn Palace menagerie - now called Tiergarten Schönbrunn. After the French Revolution, the Paris zoo was opened to the public. The first scientific zoological garden in the modern world, was founded in London in 1828, and opened to the public in 1828 as a way of funding its scientific work. Londoners soon shortened "zoological gardens" to "zoo."

Over time, the mission of zoos has shifted from simply displaying exotic animals, to scientific study (London Zoo), which was the world's first scientific zoo in 1828), and, later, to breeding them, and in particular maintaining populations of animals that are endangered or even extinct in the wild.

Most modern zoos keep animals in enclosures that attempt to replicate their natural habitats.

Many zoos now have special buildings for nocturnal animals, with dim red lighting during the day, so the animals will be active when visitors are there, and bright lights at night to ensure that they sleep.

A petting zoo features a combination of domestic animals and some wild species that are docile enough to touch and feed. Petting zoos are extremely popular with small children. In order to ensure the animals' health, the food is supplied by the zoo, either from vending machines or a kiosk nearby. In addition to independent petting zoos, also called children's farms, many general zoos contain one.

Sometimes monkeys are not separated from the public, e.g. in the Apenheul zoo in Apeldoorn. Peafowl are also frequently allowed to roam free in zoos.


Nearly all large cities of the world have zoos, though of drastically varying size and quality. Major zoos are important tourist attractions, sufficiently so that governments may underwrite or subsidize the zoo's operating expenses. Public funding of zoos is also justified by their educational value, and they are a common destination for school field trips. However, most zoo funding primarily comes from donations and entrance fees.

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Last updated: 02-07-2005 05:12:11