Domestic sheep are quadrupedal, ruminant mammals kept as livestock. Like most ruminants, sheep are members of the even-toed ungulates. Although the name sheep applies to many species in the genus Ovis, in everyday usage it always refers to Ovis aries. Numbering a little over one billion, domestic sheep are the most numerous species of sheep. An adult female sheep is referred to as a ewe, an intact male as a ram or a tup, a castrated male as a wether, a younger sheep as a lamb. Sheep are most descended from the wild mouflon of Europe and Asia. One of the earliest animals to be domesticated for agricultural purposes, sheep are raised for fleeces and milk. A sheep's wool is the most used animal fiber, is harvested by shearing. Ovine meat is called lamb when from younger animals and mutton when from older ones in Commonwealth countries, lamb in the United States. Sheep continue to be important for wool and meat today, are occasionally raised for pelts, as dairy animals, or as model organisms for science.
Sheep husbandry is practised throughout the majority of the inhabited world, has been fundamental to many civilizations. In the modern era, New Zealand, the southern and central South American nations, the British Isles are most associated with sheep production. Sheepraising has a large lexicon of unique terms which vary by region and dialect. Use of the word sheep began in Middle English as a derivation of the Old English word scēap. A group of sheep is called a herd or mob. Many other specific terms for the various life stages of sheep exist related to lambing and age. Being a key animal in the history of farming, sheep have a entrenched place in human culture, find representation in much modern language and symbology; as livestock, sheep are most associated with pastoral, Arcadian imagery. Sheep figure in many mythologies—such as the Golden Fleece—and major religions the Abrahamic traditions. In both ancient and modern religious ritual, sheep are used as sacrificial animals; the exact line of descent between domestic sheep and their wild ancestors is unclear.
The most common hypothesis states. Sheep were among the first animals to be domesticated by humankind. C in Mesopotamia; the rearing of sheep for secondary products, the resulting breed development, began in either southwest Asia or western Europe. Sheep were kept for meat and skins. Archaeological evidence from statuary found at sites in Iran suggests that selection for woolly sheep may have begun around 6000 BC, the earliest woven wool garments have been dated to two to three thousand years later. Sheep husbandry spread in Europe. Excavations show that in about 6000 BC, during the Neolithic period of prehistory, the Castelnovien people, living around Châteauneuf-les-Martigues near present-day Marseille in the south of France, were among the first in Europe to keep domestic sheep. From its inception, ancient Greek civilization relied on sheep as primary livestock, were said to name individual animals. Ancient Romans kept sheep on a wide scale, were an important agent in the spread of sheep raising.
Pliny the Elder, in his Natural History, speaks at length about wool. European colonists spread the practice to the New World from 1493 onwards. Domestic sheep are small ruminants with a crimped hair called wool and with horns forming a lateral spiral. Domestic sheep differ from their wild relatives and ancestors in several respects, having become uniquely neotenic as a result of selective breeding by humans. A few primitive breeds of sheep retain some of the characteristics of their wild cousins, such as short tails. Depending on breed, domestic sheep may have no horns at all, or horns in both sexes, or in males only. Most horned breeds have a single pair. Another trait unique to domestic sheep as compared to wild ovines is their wide variation in color. Wild sheep are variations of brown hues, variation within species is limited. Colors of domestic sheep range from pure white to dark chocolate brown, spotted or piebald. Selection for dyeable white fleeces began early in sheep domestication, as white wool is a dominant trait it spread quickly.
However, colored sheep do appear in many modern breeds, may appear as a recessive trait in white flocks. While white wool is desirable for large commercial markets, there is a niche market for colored fleeces for handspinning; the nature of the fleece varies among the breeds, from dense and crimped, to long and hairlike. There is variation of wool type and quality among members of the same flock, so wool classing is a step in the commercial processing of the fibre. Depending on breed, sheep show a range of weights, their rate of growth and mature weight is a heritable trait, selected for in breeding. Ewes weigh between 45 and 100 kilograms, rams between 45 and 160 kilograms; when all deciduous teeth have erupted, the sheep has 20 teeth. Mature sheep have 32 teeth; as with other ruminants, the front teeth in the lower jaw bite against a hard, toothless pad in the upper jaw. These are used to pick off vegetation the rear
The domestic goat or goat is a subspecies of C. aegagrus domesticated from the wild goat of Southwest Asia and Eastern Europe. The goat is a member of the animal family Bovidae and the goat—antelope subfamily Caprinae, meaning it is related to the sheep. There are over 300 distinct breeds of goat. Goats are one of the oldest domesticated species of animal, have been used for milk, meat and skins across much of the world. Milk from goats is turned into goat cheese. Female goats are referred to as does or nannies, intact males are called bucks or billies and juvenile goats of both sexes are called kids. Castrated males are called wethers. While the words hircine and caprine both refer to anything having a goat-like quality, hircine is used most to emphasize the distinct smell of domestic goats. In 2011, there were more than 924 million goats living in the world, according to the UN Food and Agriculture Organization; the Modern English word goat comes from Old English gāt "she-goat, goat in general", which in turn derives from Proto-Germanic *gaitaz from Proto-Indo-European *ǵʰaidos meaning "young goat", itself from a root meaning "jump".
To refer to the male, Old English used bucca until ousted by hegote, hegoote in the late 12th century. Nanny goat originated in the 18th billy goat in the 19th. Goats are among the earliest animals domesticated by humans; the most recent genetic analysis confirms the archaeological evidence that the wild Bezoar ibex of the Zagros Mountains is the original ancestor of all domestic goats today. Neolithic farmers began to herd wild goats for easy access to milk and meat, as well as to their dung, used as fuel, their bones and sinew for clothing and tools; the earliest remnants of domesticated goats dating 10,000 years before present are found in Ganj Dareh in Iran. Goat remains have been found at archaeological sites in Jericho, Choga Mami, Çayönü, dating the domestication of goats in Western Asia at between 8000 and 9000 years ago. Studies of DNA evidence suggests 10,000 years BP as the domestication date. Goat hide has been used for water and wine bottles in both traveling and transporting wine for sale.
It has been used to produce parchment. Each recognized breed of goat has specific weight ranges, which vary from over 140 kg for bucks of larger breeds such as the Boer, to 20 to 27 kg for smaller goat does. Within each breed, different strains or bloodlines may have different recognized sizes. At the bottom of the size range are miniature breeds such as the African Pygmy, which stand 41 to 58 cm at the shoulder as adults. Most goats have two horns, of various shapes and sizes depending on the breed. There have been incidents of polycerate goats, although this is a genetic rarity thought to be inherited. Unlike cattle, goats have not been bred to be reliably polled, as the genes determining sex and those determining horns are linked. Breeding together two genetically polled goats results in a high number of intersex individuals among the offspring, which are sterile, their horns are made of living bone surrounded by keratin and other proteins, are used for defense and territoriality. Goats are ruminants.
They have a four-chambered stomach consisting of the rumen, the reticulum, the omasum, the abomasum. As with other mammal ruminants, they are even-toed ungulates; the females have an udder consisting in contrast to cattle, which have four teats. An exception to this is the Boer goat. Goats have slit-shaped pupils; because goats' irises are pale, their contrasting pupils are much more noticeable than in animals such as cattle, most horses and many sheep, whose horizontal pupils blend into a dark iris and sclera. Both male and female goats have beards, many types of goat may have wattles, one dangling from each side of the neck. Goats expressing the tan pattern have coats pigmented with phaeomelanin; the allele which codes for this pattern is located at the agouti locus of the goat genome. It is dominant to all other alleles at this locus. There are multiple modifier genes which control how much tan pigment is expressed, so a tan-patterned goat can have a coat ranging from pure white to deep red. Goats reach puberty depending on breed and nutritional status.
Many breeders prefer to postpone breeding. However, this separation is possible in extensively managed, open-range herds. In temperate climates and among the Swiss breeds, the breeding season commences as the day length shortens, ends in early spring or before. In equatorial regions, goats are able to breed at any time of the year. Successful breeding in these regions depends more on available forage than on day length. Does of any breed or region come into estrus every 21 days for two to 48 hours. A doe in heat flags her tail stays near the buck if one is present, becomes more vocal, may show a decrease in appetite and milk production for the duration of the heat. Bucks of Swiss and northern breeds come into rut in the fall. Bucks of equatorial breeds may show seasonal reduced fertility
Cattle—colloquially cows—are the most common type of large domesticated ungulates. They are a prominent modern member of the subfamily Bovinae, are the most widespread species of the genus Bos, are most classified collectively as Bos taurus. Cattle are raised as livestock for meat, for milk, for hides, which are used to make leather, they are used as riding animals and draft animals. Another product of cattle is dung, which can be used to create fuel. In some regions, such as parts of India, cattle have significant religious meaning. Cattle small breeds such as the Miniature Zebu, are kept as pets. Around 10,500 years ago, cattle were domesticated from as few as 80 progenitors in central Anatolia, the Levant and Western Iran. According to an estimate from 2011, there are 1.4 billion cattle in the world. In 2009, cattle became one of the first livestock animals to have a mapped genome; some consider cattle the oldest form of wealth, cattle raiding one of the earliest forms of theft. Cattle were identified as three separate species: Bos taurus, the European or "taurine" cattle.
The aurochs is ancestral to both taurine cattle. These have been reclassified as one species, Bos taurus, with three subspecies: Bos taurus primigenius, Bos taurus indicus, Bos taurus taurus. Complicating the matter is the ability of cattle to interbreed with other related species. Hybrid individuals and breeds exist, not only between taurine cattle and zebu, but between one or both of these and some other members of the genus Bos – yaks and gaur. Hybrids such as the beefalo breed can occur between taurine cattle and either species of bison, leading some authors to consider them part of the genus Bos, as well; the hybrid origin of some types may not be obvious – for example, genetic testing of the Dwarf Lulu breed, the only taurine-type cattle in Nepal, found them to be a mix of taurine cattle and yak. However, cattle cannot be hybridized with more distantly related bovines such as water buffalo or African buffalo; the aurochs ranged throughout Europe, North Africa, much of Asia. In historical times, its range became restricted to Europe, the last known individual died in Mazovia, Poland, in about 1627.
Breeders have attempted to recreate cattle of similar appearance to aurochs by crossing traditional types of domesticated cattle, creating the Heck cattle breed. The noun cattle encompasses both sexes; the singular, technically means the female, the male being bull. The plural form cows is sometimes used colloquially to refer to both sexes collectively, as e.g. in a herd, but that usage can be misleading as the speaker's intent may indeed be just the females. The bovine species per se is dimorphic. Cattle did not originate as the term for bovine animals, it was borrowed from Anglo-Norman catel, itself from medieval Latin capitale'principal sum of money, capital', itself derived in turn from Latin caput'head'. Cattle meant movable personal property livestock of any kind, as opposed to real property; the word is a variant of chattel and related to capital in the economic sense. The term replaced earlier Old English feoh ` property', which survives today as fee; the word "cow" came via Anglo-Saxon cū, from Common Indo-European gʷōus = "a bovine animal", compare Persian: gâv, Sanskrit: go-, Welsh: buwch.
The plural cȳ became ki or kie in Middle English, an additional plural ending was added, giving kine, but kies and others. This is the origin of the now archaic English plural, "kine"; the Scots language singular is coo or cou, the plural is "kye". In older English sources such as the King James Version of the Bible, "cattle" refers to livestock, as opposed to "deer" which refers to wildlife. "Wild cattle" may refer to undomesticated species of the genus Bos. Today, when used without any other qualifier, the modern meaning of "cattle" is restricted to domesticated bovines. In general, the same words are used in different parts of the world, but with minor differences in the definitions; the terminology described here contrasts the differences in definition between the United Kingdom and other British-influenced parts of the world such as Canada, New Zealand and the United States. An "intact" adult male is called a bull. A wild, unmarked bull is known as a micky in Australia. An unbranded bovine of either sex is called a maverick in the Canada.
An adult female that has had a calf is a cow. A young female before she has had a calf of her own and is under three years of age is called a heifer. A young female that has had only one calf is called a first-calf heifer. Young cattle of both sexes are called calves until they are weaned weaners until they are a year old in some areas. After that, they are referred to as stirks if between one and two years of age. A castrated male is called a steer in the United States.
The nematodes or roundworms constitute the phylum Nematoda. They are a diverse animal phylum inhabiting a broad range of environments. Taxonomically, they are classified along with insects and other moulting animals in the clade Ecdysozoa, unlike flatworms, have tubular digestive systems with openings at both ends. Nematode species can be difficult to distinguish from one another. Estimates of the number of nematode species described to date vary by author and may change over time. A 2013 survey of animal biodiversity published in the mega journal Zootaxa puts this figure at over 25,000. Estimates of the total number of extant species are subject to greater variation. A referenced article published in 1993 estimated there may be over 1 million species of nematode, a claim which has since been repeated in numerous publications, without additional investigation, in an attempt to accentuate the importance and ubiquity of nematodes in the global ecosystem. Many other publications have since vigorously refuted this claim on the grounds that it is unsupported by fact, is the result of speculation and sensationalism.
More recent, fact-based estimates have placed the true figure closer to 40,000 species worldwide. Nematodes have adapted to nearly every ecosystem: from marine to fresh water, from the polar regions to the tropics, as well as the highest to the lowest of elevations, they are ubiquitous in freshwater and terrestrial environments, where they outnumber other animals in both individual and species counts, are found in locations as diverse as mountains and oceanic trenches. They are found in every part of the earth's lithosphere at great depths, 0.9–3.6 km below the surface of the Earth in gold mines in South Africa. They represent 90% of all animals on the ocean floor, their numerical dominance exceeding a million individuals per square meter and accounting for about 80% of all individual animals on earth, their diversity of lifecycles, their presence at various trophic levels point to an important role in many ecosystems. They have been shown to play crucial roles in polar ecosystem; the 2,271 genera are placed in 256 families.
The many parasitic forms include pathogens in animals. A third of the genera occur as parasites of vertebrates. Nathan Cobb, a nematologist, described the ubiquity of nematodes on Earth as thus:In short, if all the matter in the universe except the nematodes were swept away, our world would still be dimly recognizable, if, as disembodied spirits, we could investigate it, we should find its mountains, vales, rivers and oceans represented by a film of nematodes; the location of towns would be decipherable, since for every massing of human beings, there would be a corresponding massing of certain nematodes. Trees would still stand in ghostly rows representing our highways; the location of the various plants and animals would still be decipherable, had we sufficient knowledge, in many cases their species could be determined by an examination of their erstwhile nematode parasites. Modern Latin compound of nemat- "thread" + -odes "like, of the nature of". In 1758, Linnaeus described some nematode genera included in the Vermes.
The name of the group Nematoda, informally called "nematodes", came from Nematoidea defined by Karl Rudolphi, from Ancient Greek νῆμα and -eiδἠς. It was treated as family Nematodes by Burmeister. At its origin, the "Nematoidea" erroneously included Nematodes and Nematomorpha, attributed by von Siebold. Along with Acanthocephala and Cestoidea, it formed the obsolete group Entozoa, created by Rudolphi, they were classed along with Acanthocephala in the obsolete phylum Nemathelminthes by Gegenbaur. In 1861, K. M. Diesing treated the group as order Nematoda. In 1877, the taxon Nematoidea, including the family Gordiidae, was promoted to the rank of phylum by Ray Lankester; the first clear distinction between the nemas and gordiids was realized by Vejdovsky when he named a group to contain the horsehair worms the order Nematomorpha. In 1919, Nathan Cobb proposed, he argued they should be called "nema" in English rather than "nematodes" and defined the taxon Nemates, listing Nematoidea sensu restricto as a synonym.
However, in 1910, Grobben proposed the phylum Aschelminthes and the nematodes were included in as class Nematoda along with class Rotifera, class Gastrotricha, class Kinorhyncha, class Priapulida, class Nematomorpha. In 1932, Potts elevated the class Nematoda to the level of phylum. Despite Potts' classification being equivalent to Cobbs', both names have been used and Nematode became a popular term in zoological science. Since Cobb was the first to include nematodes in a particular phylum separated from Nematomorpha, some researchers consider the valid taxon name to be Nemates or Nemata, rather than Nematoda, because of the zoological rule that gives priority to the first used term in case of synonyms; the phylogenetic relationships of the nematodes and their close relatives among the protostomian Metazoa are unresolved. Traditionally, they were held to b
The domestic pig called swine, hog, or pig when there is no need to distinguish it from other pigs, is a domesticated large, even-toed ungulate. It is variously considered a subspecies of a distinct species; the domestic pig's head-plus-body-length ranges from 0.9 to 1.8 m, adult pigs weigh between 50 and 350 kg, with well-fed individuals exceeding this weight range. The size and weight of a hog depends on its breed. Compared to other artiodactyls, its head is long and free of warts. Even-toed ungulates are herbivorous, but the domestic pig is an omnivore, like its wild relative; when used as livestock, domestic pigs are farmed for the consumption of their flesh, called pork. The animal's bones and bristles are used in commercial products. Domestic pigs miniature breeds, are kept as pets; the domestic pig has a large head, with a long snout, strengthened by a special prenasal bone and a disk of cartilage at the tip. The snout is used to dig into the soil to find food, is a acute sense organ; the dental formula of adult pigs is 126.96.36.199.1.4.3.
The rear teeth are adapted for crushing. In the male the canine teeth can form tusks, which grow continuously and are sharpened by being ground against each other. Four hoofed toes are on each foot, with the two larger central toes bearing most of the weight, but the outer two being used in soft ground. Most domestic pigs have rather a bristled sparse hair covering on their skin, although woolly-coated breeds such as the Mangalitsa exist. Pigs possess both apocrine and eccrine sweat glands, although the latter appear limited to the snout and dorsonasal areas. Pigs, like other "hairless" mammals, do not use thermal sweat glands in cooling. Pigs are less able than many other mammals to dissipate heat from wet mucous membranes in the mouth through panting, their thermoneutral zone is 16 to 22 °C. At higher temperatures, pigs lose heat by wallowing in water via evaporative cooling. Pigs are one of four known mammalian species which possess mutations in the nicotinic acetylcholine receptor that protect against snake venom.
Mongooses, honey badgers and pigs all have modifications to the receptor pocket which prevents the snake venom α-neurotoxin from binding. These represent four independent mutations. Domestic pigs have small lungs in relation to their body size, are thus more susceptible than other domesticated animals to fatal bronchitis and pneumonia; the domestic pig is most considered to be a subspecies of the wild boar, given the name Sus scrofa by Carl Linnaeus in 1758. However, in 1777, Johann Christian Polycarp Erxleben classified the domestic pig as a separate species from the wild boar, he gave it the name Sus domesticus, still used by some taxonomists. Archaeological evidence suggests that pigs were domesticated from wild boar as early as 13,000–12,700 BC in the Near East in the Tigris Basin, Çayönü, Cafer Höyük, Nevalı Çori being managed in the wild in a way similar to the way they are managed by some modern New Guineans. Remains of pigs have been dated to earlier than 11,400 BC in Cyprus; those animals must have been introduced from the mainland, which suggests domestication in the adjacent mainland by then.
There was a separate domestication in China which took place about 8000 years ago. DNA evidence from subfossil remains of teeth and jawbones of Neolithic pigs shows that the first domestic pigs in Europe had been brought from the Near East; this stimulated the domestication of local European wild boar, resulting in a third domestication event with the Near Eastern genes dying out in European pig stock. Modern domesticated pigs have involved complex exchanges, with European domesticated lines being exported, in turn, to the ancient Near East. Historical records indicate that Asian pigs were introduced into Europe during the 18th and early 19th centuries. In August 2015, a study looked at over 100 pig genome sequences to ascertain their process of domestication, assumed to have been initiated by humans, involved few individuals, relied on reproductive isolation between wild and domestic forms; the study found that the assumption of reproductive isolation with population bottlenecks was not supported.
The study indicated that pigs were domesticated separately in Western Asia and China, with Western Asian pigs introduced into Europe, where they crossed with wild boar. A model that fitted the data included a mixture with a now extinct ghost population of wild pigs during the Pleistocene; the study found that despite back-crossing with wild pigs, the genomes of domestic pigs have strong signatures of selection at DNA loci that affect behavior and morphology. The study concluded that human selection for domestic traits counteracted the homogenizing effect of gene flow from wild boars and created domestication islands in the genome; the same process may apply to other domesticated animals. The adaptable nature and omnivorous diet of the wild boar allowed early humans to domesticate it readily. Pigs were used for food, but early civilizations used the pigs' hides for shields, bones for tools and weapons, bristles for brushes. In India, pigs have been domesticated for a long time in Goa and some rural areas, for pig toilets.
Though ecologically logical as well as economical
Veterinary medicine is the branch of medicine that deals with the prevention and treatment of disease and injury in non-human animals. The scope of veterinary medicine is wide, covering all animal species, both domesticated and wild, with a wide range of conditions which can affect different species. Veterinary medicine is practiced, both with and without professional supervision. Professional care is most led by a veterinary physician, but by paraveterinary workers such as veterinary nurses or technicians; this can be augmented by other paraprofessionals with specific specialisms such as animal physiotherapy or dentistry, species relevant roles such as farriers. Veterinary science helps human health through the monitoring and control of zoonotic disease, food safety, indirectly through human applications from basic medical research, they help to maintain food supply through livestock health monitoring and treatment, mental health by keeping pets healthy and long living. Veterinary scientists collaborate with epidemiologists, other health or natural scientists depending on type of work.
Ethically, veterinarians are obliged to look after animal welfare. Archeological evidence, in the form of a cow skull upon which trepanation had been performed, shows that people were performing veterinary procedures in the Neolithic; the Egyptian Papyrus of Kahun is the first extant record of veterinary medicine. The Shalihotra Samhita, dating from the time of Ashoka, is an early Indian veterinary treatise; the edicts of Asoka read: "Everywhere King Piyadasi made two kinds of medicine available, medicine for people and medicine for animals. Where there were no healing herbs for people and animals, he ordered that they be bought and planted."Hippiatrica is a Byzantine compilation of hippiatrics, dated to the 5th or 6th century. The first attempts to organize and regulate the practice of treating animals tended to focus on horses because of their economic significance. In the Middle Ages, farriers combined their work in horseshoeing with the more general task of "horse doctoring"; the Arabic tradition of Bayṭara, or Shiyāt al-Khayl, originates with the treatise of Ibn Akhī Hizām.
In 1356, the Lord Mayor of London, concerned at the poor standard of care given to horses in the city, requested that all farriers operating within a seven-mile radius of the City of London form a "fellowship" to regulate and improve their practices. This led to the establishment of the Worshipful Company of Farriers in 1674. Meanwhile, Carlo Ruini's book Anatomia del Cavallo, was published in 1598, it was the first comprehensive treatise on the anatomy of a non-human species. The first veterinary school was founded in France in 1762 by Claude Bourgelat. According to Lupton, after observing the devastation being caused by cattle plague to the French herds, Bourgelat devoted his time to seeking out a remedy; this resulted in his founding a veterinary school in Lyon in 1761, from which establishment he dispatched students to combat the disease. The school received immediate international recognition in the eighteenth century and its pedagogical model drew on the existing fields of human medicine, natural history, comparative anatomy.
The Odiham Agricultural Society was founded in 1783 in England to promote agriculture and industry, played an important role in the foundation of the veterinary profession in Britain. A founding member, Thomas Burgess, began to take up the cause of animal welfare and campaign for the more humane treatment of sick animals. A 1785 Society meeting resolved to "promote the study of Farriery upon rational scientific principles." The physician James Clark wrote a treatise entitled Prevention of Disease in which he argued for the professionalization of the veterinary trade, the establishment of veterinary colleges. This was achieved in 1790, through the campaigning of Granville Penn, who persuaded the Frenchman, Benoit Vial de St. Bel to accept the professorship of the newly established Veterinary College in London; the Royal College of Veterinary Surgeons was established by royal charter in 1844. Veterinary science came of age in the late 19th century, with notable contributions from Sir John McFadyean, credited by many as having been the founder of modern Veterinary research.
In the United States, the first schools were established in the early 19th century in Boston, New York and Philadelphia. In 1879, Iowa Agricultural College became the first land grant college to establish a school of veterinary medicine. Veterinary care and management is led by a veterinary physician; this role is the equivalent of a doctor in human medicine, involves post-graduate study and qualification. In many countries, the local nomenclature for a vet is a protected term, meaning that people without the prerequisite qualifications and/or registration are not able to use the title, in many cases, the activities that may be undertaken by a vet are restricted only to those people who are registered as vet. For instance, in the United Kingdom, as in other jurisdictions, animal treatment may only be performed by registered vets, it is illegal for any person, not registered to call themselves a vet or perform any treatment. Most vets work in clinical s