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Ovis is a genus of , part of the Caprinae subfamily of the ruminant family Bovidae. Its seven species are highly sociable, and are known as sheep or ovines. Domestic sheep are members of the genus, and are thought to be descended from the wild mouflon of central Asia and southwest Asia.
The bodies of wild sheep (and some domestic breeds) are covered by a coat of thick hair to protect them from cold. This coat contains long, stiff hairs, called kemps, over a short, woolly undercoat, which grows in autumn and is shed in spring.Clutton-Brock, J. 1999. A Natural History of Domesticated Mammals. Cambridge, UK : Cambridge University Press This woolly undercoat has been developed in many domestic sheep breeds into a fleece of long wool, with selection against kemp hairs in these breeds. The fleece covers the body (in a few breeds also the face and legs) and is used for fibre. Domestic sheep are also reared for their milk and meat (which is called lamb or mutton depending on the age of the animal).
In wild sheep, both rams and ewes have horns, while in domestic sheep (depending upon breed) horns may be present in both rams and ewes, in rams only, or in neither. Rams' horns may be very large – those of a mature bighorn ram can weigh – as much as the bones of the rest of its body put together. Rams use their horns to fight with each other for dominance and the right to mate with females. In most cases, they do not injure each other because they hit each other head-to-head, and their curved horns do not strike each other's bodies. They are also protected by having very thick skin and double-layered skulls.Voelker, W. 1986. The Natural History of Living Mammals. Medford, New Jersey: Plexus Publishing, Inc.
Wild sheep have very keen senses of sight and hearing. When detecting predators, wild sheep most often flee, usually to higher ground, but they can also fight back. The Dall sheep has been known to butt wolf off the face of cliffs.
Sheep have on their faces and feet. Communication through the scent glands is not well understood, but is thought to be important for sexual signaling. Males can smell females that are in estrus, and rams mark their territories by rubbing scent on rocks.
Females typically are separated from males outside the rut, but during the rut, females and males are found together. Females that are oestrous isolate themselves from other ewes, and may be less mobile. The rut is also linked with different ewe behaviour than during nonrutting periods. These changes are characterized by decreased feeding, increased time observing their surroundings, and increased behaviour changes. Ewes are also predicted to be slightly receptive to the displays of the rams.
Species
Seven species (and numerous subspecies) of sheep are currently recognized. The main recognized divisions are:
central Kazakhstan in the west to the Shanxi Province in China Domesticated North America northwestern North America. eastern Turkey, Armenia, Azerbaijan, and Iran northeast of Siberia Central and South Asia. A fossil species from the Early Pleistocene of Taurida Cave, Crimea.
Behaviour
Sheep are social animals and live in groups, called flocks. This helps them to avoid and stay warm in cold weather by huddling together. Flocks of sheep need to keep moving to find new grazing areas and more favourable weather as the seasons change. In each flock, a sheep, usually a mature ram, is followed by the others. This "leader to follower" relationship can be both a positive and negative for flocks of Ovis aries. Although there is safety in numbers, it has been reported that the following of one mature ram can bring flocks to slaughter in many situations where the mature ram misguides the flock.
Mating
Mating in sheep is characterized by males competing for females in estrus. Social rank in rams is established by male-male competition during the rutting period. Females select from dominant males based on sexually selected characteristics such as body size and horn size, as those traits are desirable in offspring.
See also
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