The taxonomy of the genus Ovis is controversial. Various authorities have lumped O. aries (domestic sheep) with O. orientalis (mouflon) as members of the same species. Others recognize the two as distinct species, but claim that O. orientalis is the ancestral species from which domestic sheep were derived. Some consider populations of sheep on the islands of Corsica and Sardinia as subspecies of O. orientalis, whereas others separate them as a distinct species. In north India, populations of O. ammon and O. aries vignei occur near one another, and some think they represent a single species. There are also those who consider O. orientalis and O. aries vignei conspecific.
Complicating matters further, the genus Ovis has also been considered by some to be synonymous with the genus Capra (goats) because of fertile hybrids produced between C. hircus (domestic goats) and O. aries (domestic sheep).
All wild species of sheep are allopatric, however, hybridization can, and does, occur (Nowak, 1999). Urial sheep represent a chromosomal, geographic and morphological extreme amongst the wild sheep of Iran. Urial sheep (2N=58) hybridize with Ovis orientalis (2N=54), producing a 150 kilometer zone of hybridization. Hybrids in the hybridization zone display variable pelage and chromosome number (54-58). (Valdez et al., 1978) .
Details regarding communication in this species are lacking. However, it is known that males have aggressive physical encounters by which they establish and communicate dominance relationships. Tactile communication seems likely. Females communicate their estrous status to adult males via chemical cues in their urine. Also, mothers and infant recognize one another based on scent, so olfactory communication plays an important role in this species. Based upon the vocalizations of domestic sheep, probably domesticated from a common ancestor (Nowak, 1999), it would seem likely that there is also some amount of acoustic communication, although this is reportedly not common. (Nowak, 1999; Valdez, 1982).
Communication Channels: tactile ; acoustic ; chemical
Other Communication Modes: pheromones
Perception Channels: visual ; tactile ; acoustic ; chemical
Ovis aries vignei is a CITES Appendix I subspecies. It is listed by the IUCN as vulnerable as part of O. orientalis (see additional comments below). It is clear that populations are decreasing, regardless of the taxonomy used. Expansion of agriclture into wild sheep habitat, other human habitat modifications, and indiscriminant hunting for trophies has led to a serious decline (Nowak, 1999). Ovis aries vignei is considered especially vulnerable because it inhabits the low, open country where people commonly graze their livestock (Nowak, 1999). This makes these animals especially susceptible to competition from domestic livestock for food resources. Two of the subspecies hardest hit, according to Nowak (1999) are O. v. vignei and O. v. punjabiensis, each with an estimated remaining population around 2,000 individuals.
US Federal List: endangered
CITES: appendix i; appendix ii
Urial sheep may be a potential pest on agricultural fields.
Negative Impacts: crop pest
Urial sheep provide recreational value as a game species.
Positive Impacts: food ; body parts are source of valuable material
Urial sheep have the capability to influence vegetative composition in their habitat through grazing.
Ovis aries vignei is herbivorous. It consumes a variety of unspecified plants, presumably grasses and shrubs. It will also eat grains.
Plant Foods: leaves; wood, bark, or stems; seeds, grains, and nuts
Primary Diet: herbivore (Folivore )
Urial sheep are widely distributed in Asia minor. They are found from southwestern Kazakhstan through Turkmenistan, Uzbekistan, Tajikistan, Afgahnistan, Pakistan, and into the Kashmir region of India. They range eastward into Iran, and some are found in Oman, although that population is thought to have been introduced.
Biogeographic Regions: palearctic (Native ); oriental (Native )
Urial sheep inhabit steep to undulating grassy terrain, to an elevation of 6,000 m. Their habitat tends to be moderately to very arid. They may also be found in agricultural fields and sometimes enter partly wooded areas.
Range elevation: 0 to 6000 m.
Habitat Regions: temperate ; terrestrial
Terrestrial Biomes: desert or dune ; forest ; mountains
Other Habitat Features: agricultural
Lifespan of urial sheep ranges from 8 to 12 years.
Typical lifespan
Status: wild: 8 to 12 years.
Males of this species may weigh up to 90 kg and have a shoulder height up to 1m. Overall, they are brown colored with a lighter coat in summer than in winter. They have a distinct white rump patch below the base of the tail and along the back of the hind quarters. Urial sheep have a black and white saddle patch. Males have a black neck ruff which is restricted to the front of the neck and brisket.
Males are reported to have massive horns, whereas female horns are much smaller. Horn shape may be variable, but tends to be in a supracervical arangement. The greatest horn length recorded was 990.6 mm and greatest basal circumference was 304.8 mm.
Urial sheep have antelope-like features, characterized by sinewy bodies and long legs.
Range mass: 90 (high) kg.
Average mass: 90 kg.
Other Physical Features: endothermic ; homoiothermic; bilateral symmetry
Sexual Dimorphism: male larger; ornamentation
Predation has not been specifically reported for these animals. They are agile climbers, and their antelope-like features may help them to evade predators. It is likely that large eagles, canids, and large felids, where present, could take young sheep.
Urial sheep males are polygynous, but males do not accumulate a harem. Males approach females slowly in a stretched posture. The female reacts by squatting and urinating. The males then smells the female's urine to determine chemically whether she is in estrus. Females in estrus are claimed by the dominant male. After copulation, the dominant male gaurds female from other males until she is no longer in estrous. Once the female is no longer receptive, the male will leave in search of another female in estrus.
Mating System: polygynous
Reproductive patterns of Urial sheep may be inferred from those of relatives. Moufloniforms are monoestrous and breed during rutt between November and December. Ewes become sexually mature at 1.5 years of age, and may bear their first young at 2 years of age. Estrous lasts for 1-2 days. Copulation is speedy, lasting a mere 2-3 seconds. Gestation is long, lasting 150-160 days.
Ewes give birth to one lamb per pregnancy until they are above 3 years old. Older ewes may give birth to 2 or 3 lambs. The probability of twinning in ewes over 4 years old is 0.50. At birth, lambs weigh between 6 and 10 pounds. In a well nourished population all ewes of breeding age will bear young. Lambs nurse for 5-6 months, although they may nibble on vegetation within 1 month after birth. The life span of this species ranges from 8 to 12 years.
Breeding interval: Urial sheep breed once yearly.
Breeding season: The rutt occurs in November through December.
Range number of offspring: 1 to 2.
Range gestation period: 5 to 5.33 months.
Average age at sexual or reproductive maturity (female): 1.5 years.
Average age at sexual or reproductive maturity (male): 1.5 years.
Key Reproductive Features: seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; viviparous
Ewes segregate themselves from the herd prior to giving birth. After giving birth, females and their young remain apart from the herd for 3 to 7 days. During this time the lamb gains strength and both the mother and her offspring learn to recognize each other by smell. The ewes and lambs then return to the herd. Moufloniforms do not form nursery bands.
Parental Investment: pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Female); pre-weaning/fledging (Provisioning: Female); post-independence association with parents; extended period of juvenile learning
The urial (/ˈʊəriəl/ OOR-ee-əl; Ovis vignei), also known as the arkars or shapo, is a wild sheep native to Central and South Asia. It is listed as Vulnerable on the IUCN Red List.[1]
Urial males have large horns, curling outwards from the top of the head turning in to end somewhere behind the head; females have shorter, compressed horns. The horns of the males are up to 100 cm (39 in) long. The shoulder height of an adult male urial is between 80 and 90 cm (31 and 35 in).
The urial is native to montane areas in the Pamir Mountains, Hindu Kush and Himalayas up to an elevation of 4,500 m (14,800 ft); it is distributed from northeastern Iran, Afghanistan, Turkmenistan, Tajikistan, Uzbekistan and southwestern Kazakhstan to northern Pakistan and Ladakh in northwestern India. It prefers grassland, open woodland and gentle slopes, but also inhabits cold arid zones with little vegetation.[1]
The mating season begins in September. Rams select four or five ewes, which give birth to a lamb after a gestation of five months.
The vignei subspecies group consists of six individual subspecies:
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The urial (/ˈʊəriəl/ OOR-ee-əl; Ovis vignei), also known as the arkars or shapo, is a wild sheep native to Central and South Asia. It is listed as Vulnerable on the IUCN Red List.
