Ovis aries vignei
urial

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. (Nowak, 1999; Valdez, 1982)

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. (Valdez, 1982)

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. (Valdez, 1982)

Lifespan of urial sheep ranges from 8 to 12 years. (Valdez, 1982)

These sheep are mainly diurnal, and spend most of their day foraging. They move throughout a range, but do not maintain territories (Valdez, 1982).

Urial sheep are gregarious and form herds of related individuals. Herds usually are comprised of females, lambs, and juveniles. Adult rams form separate all-male groups. Seperation of herds eliminates competition for forage and reduces female harassment. Herds have a social structure in whch dominance is based on body size. Dominance relationships are especially evident in ram herds, where dominance is largely based on horn size--the larger the horns, the higher the dominance rank (Nowak, 1999; Valdez, 1982).

Dominant males act as a stabalizing force in sheep society by preventing younger rams from harassing females. Young males are more aggressive and bullying towards ewes thn are older males. Agressive encounters between similar-sized individuals usually include head twists and front kicks. Urial sheep do not rise on to back legs before clashing (Valdez, 1982). (Nowak, 1999; Valdez, 1982)

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). (Nowak, 1999; Valdez, 1982)

Ovis aries vignei is herbivorous. It consumes a variety of unspecified plants, presumably grasses and shrubs. It will also eat grains. (Nowak, 1999; Valdez, 1982)

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 have the capability to influence vegetative composition in their habitat through grazing. (Valdez, 1982)

Urial sheep may be a potential pest on agricultural fields. (Valdez, 1982)

Urial sheep provide recreational value as a game species. (Valdez, 1982)

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. (Nowak, 1999; Valdez, 1982)

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) . (Nowak, 1999; Valdez, 1982; Valdez, Nadler, and Bunch, March 1978)