Donkey
The donkey is a domesticated equine. It derives from the African wild ass, Equus africanus, and may be classified either as a subspecies thereof, Equus africanus asinus, or as a separate species, Equus asinus.[1]: 1 It was domesticated in Africa some 5000–7000 years ago,[1]: 2 [2]: 3715 [3] and has been used mainly as a working animal since that time.
For other uses, see Donkey (disambiguation).
There are more than 40 million donkeys in the world, mostly in underdeveloped countries, where they are used principally as draught or pack animals. While working donkeys are often associated with those living at or below subsistence, small numbers of donkeys or asses are kept for breeding or as pets in developed countries.
An adult male donkey is a jack or jackass, an adult female is a jenny or jennet,[4][5][6] and an immature donkey of either sex is a foal.[6] Jacks are often mated with female horses (mares) to produce mules; the less common hybrid of a male horse (stallion) and jenny is a hinny.
Traditionally, the scientific name for the donkey is Equus asinus asinus, on the basis of the principle of priority used for scientific names of animals. However, the International Commission on Zoological Nomenclature ruled in 2003 that if the domestic and the wild species are considered subspecies of a common species, the scientific name of the wild species has priority, even when that subspecies was described after the domestic subspecies.[7] This means that the proper scientific name for the donkey is Equus africanus asinus when it is considered a subspecies and Equus asinus when it is considered a species.[8][7]
At one time, the synonym ass was the more common term for the donkey. The first recorded use of donkey was in either 1784[9] or 1785.[10][11][12]: 239 While the word ass has cognates in most other Indo-European languages, donkey is an etymologically obscure word for which no credible cognate has been identified. Hypotheses on its derivation include the following:
From the 18th century, donkey gradually replaced ass and jenny replaced she-ass, which is now considered archaic.[15] The change may have come about through a tendency to avoid pejorative terms in speech and may be comparable to the substitution in North American English of rooster for cock, or that of rabbit for coney, which was formerly homophonic with cunny (a variation of the word cunt). By the end of the 17th century, changes in pronunciation of both ass and arse had caused them to become homophones in some varieties of English.[12]: 239 Other words used for the ass in English from this time include cuddy in Scotland, neddy in southwestern England and dicky in southeastern England;[12]: 239 moke is documented in the 19th century and may be of Welsh or Romani origin.
Burro is a word for donkey in both Spanish and Portuguese. In the United States, it is commonly applied to the feral donkeys that live west of the Rocky Mountains;[16] it may also refer to any small donkey.[17]: 147
Donkey hybrids
The earliest documented donkey hybrid was the kunga, which was used as a draft animal in the Syrian and Mesopotamian kingdoms of the second half of the 3rd millennium BCE. A cross between a captive male Syrian wild ass and a female domesticated donkey (jenny), they represent the earliest known example of human-directed animal hybridization. They were produced at a breeding center at Nagar (modern Tell Brak) and were sold or given as gifts throughout the region, where they became significant status symbols, pulling battle wagons and the chariots of kings, and also being sacrificed to bury with high-status people. They fell out of favor following the introduction of the domestic horse and its donkey hybrid, the mule, into the region at the end of the 3rd millennium BCE.[80]
A male donkey (jack) crossed with a female horse produces a mule, while a male horse crossed with a jenny produces a hinny. Horse–donkey hybrids are almost always sterile because of a failure of their developing gametes to complete meiosis.[81] The lower progesterone production of the jenny may also lead to early embryonic loss. In addition, there are reasons not directly related to reproductive biology. Due to different mating behavior, jacks are often more willing to cover mares than stallions are to breed jennies. Further, mares are usually larger than jennies and thus have more room for the ensuing foal to grow in the womb, resulting in a larger animal at birth. It is commonly believed that mules are more easily handled and also physically stronger than hinnies, making them more desirable for breeders to produce.
The offspring of a zebra–donkey cross is called a zonkey, zebroid, zebrass, or zedonk;[82] zebra mule is an older term, but still used in some regions today. The foregoing terms generally refer to hybrids produced by breeding a male zebra to a female donkey. Zebra hinny, zebret and zebrinny all refer to the cross of a female zebra with a male donkey. Zebrinnies are rarer than zedonkies because female zebras in captivity are most valuable when used to produce full-blooded zebras.[83] There are not enough female zebras breeding in captivity to spare them for hybridizing; there is no such limitation on the number of female donkeys breeding.
