Jacob Sheep

The Jacob is a British breed of domestic sheep that combines two characteristics unusual in sheep: it is piebald, dark with areas of white wool, and it most commonly has four horns. The origin of the breed is not known, but broken-coloured, many-horned sheep were present in England by the middle of the seventeenth century. For centuries it was kept as a park sheep to ornament large estates, and today it is reared mainly for wool, meat and skins. Ewes weigh 60–65 kg and rams 80–100 kg. Markings are distinctive enough for a shepherd to identify individuals from a distance. The classic face is called badger-faced, with black cheeks and muzzle and a white blaze.

About the Jacob sheep

The Jacob is a British breed of domestic sheep, the same species (Ovis aries) as other sheep, set apart by two unusual traits: a piebald fleece of dark patches on white, and most commonly four horns. Of unknown origin, it has been raised in England for at least 350 years and is now kept in North America.

Sheep of this type, little different from the modern breed, appear in English paintings from about 1760, including work by George Stubbs. For much of its recorded history the breed was called the "Spanish sheep," and one family legend held that the spotted sheep swam ashore in Ireland from a wrecked ship of the Spanish Armada in 1588. The name "Jacob" came only in the 20th century, after the Biblical story in Genesis in which Jacob breeds the speckled and spotted sheep from his father-in-law's flock.

Despite the name, there is little genetic evidence linking the breed to the ancient Near East. A 2009 study using retrovirus markers found the Jacob more closely related to sheep from Africa and Southwest Asia than to other British breeds, though every domestic breed traces back to the Fertile Crescent. An Israeli sheep expert has called the Biblical resemblance a coincidence.

The Jacob is a medium to large sheep with a long frame, straight back and a rump that slopes toward the tail. In Britain, ewes usually weigh 60–65 kg (130–145 lb) and rams 80–100 kg (175–220 lb). American Jacobs are considerably lighter: about 40–50 kg (90–110 lb) for ewes and 55–80 kg (120–175 lb) for rams. The head is slender, triangular and free of wool in front of the horns. Unlike the short-tailed sheep of northern Europe, the Jacob is long-tailed, and owners usually leave several inches of tail even when docking.

The horns are the headline. Both sexes are always horned, with anywhere from two to six horns, most often four. Four-horned rams carry two vertical center horns that can reach 61 cm (2 ft) or more, plus two smaller side horns curling down along the head. Ewes' horns are shorter and more delicate. Horns are normally black or black-and-white striped. A hornless sheep cannot be registered as a purebred Jacob, since that trait points to past crossbreeding.

The coat is ideally about 60% white, with the rest a random pattern of black or "lilac" (brownish-gray) spots. The skin is pink under white wool and dark under the spots. The classic "badger face" has black cheeks and muzzle split by a white blaze, and each sheep's markings are distinct enough for a shepherd to recognize it from a distance.

Behavior and diet

Like all sheep, Jacobs are ruminants. They graze grass and other short forage, chew it into a mass and pass it into the rumen, a fermentation chamber of 19–38 liters (5–10 gallons). Sheep generally prefer short grass and avoid the taller woody plants that goats readily eat. Jacobs are known as good to excellent foragers that can stay well fed with little or no supplemental feed, even on poor soil.

The breed is considered "unimproved," meaning it has survived with little human selection, and it keeps much of its original hardiness. Jacobs have a naturally high resistance to parasites and hoof problems, thrive in both heat and cold, and need only simple, open shelter from extreme weather. Sheep in general have horizontal slit pupils and visual fields of about 270° to 320°, so they can see behind themselves without turning their heads.

Unlike many sheep, Jacobs do not show much flocking behavior. They can be skittish around strangers, but with daily handling they become tame and make good pets.

Jacobs are seasonal breeders, and ewes come into heat in the cool autumn months. A ewe usually starts cycling in her first autumn and often has a single lamb the first time. After that she typically has one or two lambs each spring, and triplets are not unusual. Ewes are known for easy lambing and attentive, protective mothering, which is why some English commercial flocks include them. Lambs are born already showing their spots and horn buds, and are weaned at two to four months.

Range and habitat

The Jacob is a domestic breed, so its "range" is where people raise it. For centuries it was a "park sheep," kept by Britain's landed gentry to decorate large estates, and repeated imports by those owners probably kept the breed going. A breed society, the Jacob Sheep Society, formed in 1969, with the Duchess of Devonshire, who kept a flock at Chatsworth House, as its first president. A flock book followed from 1972. Today Jacobs are raised mainly for wool, meat and skins.

Jacobs first reached North America in the early 20th century. The breed stayed rare in America until the 1980s; U.S. registration began in 1985 and the Jacob Sheep Breeders Association formed in 1988. Small populations are also reported from the Czech Republic, Germany and the Netherlands, and a flock of about 120 was shipped from Canada to Israel in 2016.

British Jacob vs American Jacob

The breed has split into two noticeably different types on either side of the Atlantic.

Conservation status

As a domestic breed, the Jacob is not assessed on the IUCN Red List. Breed-level status comes from livestock organizations instead. In 2012 the UK population was reported to the FAO's DAD-IS database as 5,638 animals, including 2,349 registered breeding ewes. In 2017 the Rare Breeds Survival Trust placed the Jacob in Category 6, "Other UK Native Breeds," meaning it has more than 3,000 registered breeding females and is outside the at-risk categories 1 to 5.

Outside Britain the picture is less secure. The small Jacob populations in the Czech Republic, Germany, the Netherlands and the United States are rated anywhere from critical to endangered-maintained in those countries.

The breed also matters to medicine. In 2008 researchers in Texas found the genetic defect behind Tay–Sachs disease in humans in four Jacob lambs, and about 50 carriers were later identified among U.S. Jacobs. Research on these sheep fed into a gene therapy given to two babies with the disease in 2022.