Breeds

The gestation period for sheep is 147 days with 16.7 days between periods of estrus, which last 29 hours. The average number of lambs raised per hundred ewes is 91, and the average fleece weight per shearing is 8.34 pounds (3.78 kilograms).

Selected breeds of sheep
name	type of wool	distribution	characteristics	comments
Black-Faced Highland, also called Scottish Blackface	carpet	originally Scotland, now also U.S., Italy, Argentina	black or mottled, horned	stylish appearance
Columbia	medium	developed in U.S. since 1912	large, white-faced, hornless	high wool yield; mutton acceptable
Corriedale	medium	developed in N.Z., now also in U.S., Australia	white-faced, hornless	bright, soft fleece; good quality lambs
Cotswold	long	originally England, now also U.S.	large, white-faced, hornless	coarse, curly fleece; acceptable mutton
Dorset	medium	developed in England, now in U.K., U.S., Australia	medium-sized, white-faced	small wool yield; out-of-season lambs; horned and hornless varieties
Hampshire	medium	developed in England, now also widespread in U.S.	large, hornless; dark face and legs	superior mutton breed; limited wool
Karakul	fur	originally Central Asia, now also Africa, Europe, U.S.	medium-sized, fat-tailed	coats of very young lambs called Persian lamb
Leicester	long	originally England, now U.K., North America	massive body, white-faced, broad-backed	heavy fleece
Lincoln	long	originally England, now also Australia, N.Z., North and South America	world's largest sheep, hornless	coarse, long wool is used chiefly for carpets
Merino	fine	originally Spain, now also Australia, North America, South Africa	horned or hornless, heavily-wooled head	excellent, fine, soft fleeces
North Country Cheviot	medium	originally Scotland, now widespread	white chalk; large, deep-bodied	hardy; produces superior fleece
Rambouillet	fine	developed in France from the 18th century, now also in U.S.	smooth-bodied, horned or hornless	lambs mature rapidly; bred from Merino
Romney	long	originally England, now also N.Z., North America, Australia	hornless with white face and legs	mostly raised for mutton; wool used for variety of products
Southdown	medium	originally England, now also N.Z., Australia, North America	hornless with small, rounded body	raised for mutton; fleece is short
Suffolk	medium	developed in England, now also in U.S.	black face and legs, large, hornless	fine mutton breed; acceptable wool

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Of more than 200 breeds of sheep in existence in the world, the majority are of limited interest except in the localities where they are raised. Sheep breeds are generally classified as medium wool, long wool, and fine wool. Of the medium wool breeds the Hampshire, Shropshire, Southdown, Suffolk, Oxford, and Dorset all originated in England. The Cheviot and Black Faced Highland originated in Scotland. The Panama, Columbia, and Targhee were developed in the United States, and the Corriedale in New Zealand. After World War II such larger breeds as the Suffolk and Hampshire increased in popularity at the expense of the smaller breeds.

The long wool breeds, including the Cotswold, Lincoln, Leicester, and Romney, were all developed in England and, in addition to mutton, produce wool of unusually long fibre length that is suitable for rugs and coarse fabrics.

The original fine-wool breed was the Merino, developed in Spain from stock native to that country before the Christian era. Though medieval Spain sought to preserve a monopoly on the Merino, the sheep gradually spread to France, Italy, and the rest of Europe. Today the Merino is prominent in Australia, the United States, Russia, South Africa, Argentina, France, and Germany; the breed is designated by various names such as Australian Merino in Australia and Merino Transhumante in Spain. The Merino was the main ancestor of the French Rambouillet, somewhat larger and less wrinkled than the Merino. This breed prospers in the western ranges of the United States, where two-thirds of that country’s sheep are raised. The Corriedale breed, adapted to both farms and ranges, is especially valued in New Zealand and Australia. Most commercial sheep today represent two-breed or three-breed crosses, with white-faced crossbred ewes preferred in the range areas and a black-faced sire, such as Suffolk or Hampshire, preferred for market lambs, which are either finished for slaughter or sold as breeding ewes.