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Horse Teeth
Horse teeth refers to the dentition of equine species, including horses and donkeys. Equines are both heterodontous and diphyodontous, which means that they have teeth in more than one shape (there are up to five shapes of tooth in a horse's mouth), and have two successive sets of teeth, the deciduous ("baby teeth") and permanent sets. As grazing animals, good dentition is essential to survival. Continued grazing creates specific patterns of wear, which can be used along with patterns of eruption to estimate the age of the horse. Types of teeth A fully developed horse of around five years of age will have between 36 and 44 teeth. All equines are heterodontous, which means that they have different shaped teeth for different purposes. All horses have twelve incisors at the front of the mouth, used primarily for cutting food, most often grass, whilst grazing. They are also used as part of a horse's attack or defence against predators, or as part of establishing social hie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yawning Horse, Scotland
A yawn is a reflex lasting 4-7 seconds, and is characterized by a long inspiratory phase with gradual mouth gaping, followed by a brief climax (or acme) with muscle stretching, and a rapid expiratory phase with muscle relaxation. For fish and birds, this is described as gradual mouth gaping, staying open for at least 3 seconds and subsequently a rapid closure of the mouth. Almost all vertebrate animals, including mammals, birds, reptiles, amphibians, and even fish, experience yawning. The study of yawning is called chasmology. Yawning (oscitation) most often occurs in adults immediately before and after sleep, during tedious activities and as a result of its contagious quality. It is commonly associated with tiredness, stress, sleepiness, boredom, or even hunger. In humans, yawning is often triggered by the perception that others are yawning (for example, seeing a person yawning, or talking to someone on the phone who is yawning). This is a typical example of positive feedba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wolf Teeth
Wolf teeth are small, peg-like horse teeth, which sit just in front of (or rostral to) the first cheek teeth of horses and other equids. They are vestigial first premolars, and the first cheek tooth is referred to as the second premolar even when wolf teeth are not present. Torbjörn Lundström in Sweden reported that about 45-50% of 25000 horses had wolf teeth. They are much less common in the mandible (lower jaw) than the maxilla (upper jaw) although mandibular wolf teeth are found very occasionally. They do not have any deciduous precursors, but they may themselves be deciduous, as it is believed that they are often shed when the deciduous 2nd premolar is shed at around two and a half years of age. They may also be knocked out by the bit if particularly loose, and can certainly be extracted accidentally, either partially or whole, when routine equine dentistry is performed. In size they are extremely variable from being small pegs only 3 mm in diameter to having roots up ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veterinary Dentistry
Veterinary dentistry is the field of dentistry applied to the care of animals. It is the art and science of prevention, diagnosis, and treatment of conditions, diseases, and disorders of the oral cavity, the maxillofacial region, and its associated structures as it relates to animals. In the United States, veterinary dentistry is one of 20 veterinary specialties recognized by the American Veterinary Medical Association (AVMA). Veterinary dentists offer services in the fields of endodontics, oral and maxillofacial radiology and surgery, oral medicine, orthodontics, pedodontics, periodontics, and prosthodontics. Similar to human dentists, they treat conditions such as jaw fractures, malocclusions, oral cancer, periodontal disease, stomatitis, and other conditions unique to veterinary medicine (e.g. feline odontoclastic resorptive lesions). Some animals have specialized dental workers, such as equine dental technicians, who conduct routine work on horses. Overview The practice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cribbing (horse)
Cribbing is a form of stereotypy (equine oral stereotypic behaviour), otherwise known as wind sucking or crib-biting. Cribbing is considered to be an abnormal, compulsive behavior seen in some horses, and is often labelled a stable vice. The major factors that cause cribbing include stress, stable management, genetic and gastrointestinal irritability. Cribbing was mentioned in the literature as early as 1578 and occurs in 2.4-8.3% of horses depending on breed and management. A similar but unrelated behavior, wood-chewing or lignophagia, is another undesirable habit observed in horses, but it does not involve sucking in air; the horse simply gnaws on wood rails or boards as if they were food. Description Cribbing, or crib biting, involves a horse grasping a solid object such as the stall door or fence rail with its incisor teeth, arching its neck, and contracting the lower neck muscles to retract the larynx caudally. This movement is coincided with an in-rush of air through the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miniature Horse
A miniature horse is a breed or type of horse characterised by its small size. Usually it has been bred to display in miniature the physical characteristics of a full-sized horse, but to be little over in height, or even less. Although such horses have the appearance of small horses, they are genetically much more similar to pony breeds such as the Shetland. They have various colors and coat patterns. Miniature horses are present in several countries, including Argentina, Australia, France, Germany, Holland, Ireland, Namibia, the Philippines, the United Kingdom and the United States. In some countries they have the status of a breed; these include the Falabella of Argentina, the Dutch Miniature or , the South African Miniature Horse and the American Miniature Horse. They are commonly kept as companion animals. Some are trained as service animals, and others for sporting activities such as driving and other competitive horse show events. History Miniature horses originated in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Draft Horse
A draft horse (US), draught horse (UK) or dray horse (from the Old English ''dragan'' meaning "to draw or haul"; compare Dutch ''dragen'' and German ''tragen'' meaning "to carry" and Danish ''drage'' meaning "to draw" or "to fare"), less often called a carthorse, work horse or heavy horse, is a large horse bred to be a working animal doing hard tasks such as plowing and other farm labor. There are a number of breeds, with varying characteristics, but all share common traits of strength, patience, and a docile temperament which made them indispensable to generations of pre-industrial farmers. Draft horses and draft crossbreds are versatile breeds used today for a multitude of purposes, including farming, draft horse showing, logging, recreation, and other uses. They are also commonly used for crossbreeding, especially to light riding breeds such as the Thoroughbred, for the purpose of creating sport horses of warmblood type. While most draft horses are used for driving, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shetland Pony
The Shetland pony is a Scottish breed of pony originating in the Shetland Isles in the north of Scotland. It may stand up to at the withers. It has a heavy coat and short legs, is strong for its size, and is used for riding, driving, and pack purposes. History Shetland ponies originated in the Shetland Isles, located northeast of mainland Scotland. Small horses have been kept in the Shetland Isles since the Bronze Age. People who lived on the islands probably later crossed the native stock with ponies imported by Norse settlers. Shetland ponies also were probably influenced by the Celtic pony, brought to the islands by settlers between 2000 and 1000 BCE. The harsh climate and scarce food developed the ponies into extremely hardy animals. Shetland ponies were first used for pulling carts and for carrying peat, coal and other items, and ploughing land. Then, as the Industrial Revolution increased the need for coal in the mid-nineteenth century, thousands of Shetland pon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Horse Teeth
Horse teeth refers to the dentition of equine species, including horses and donkeys. Equines are both heterodontous and diphyodontous, which means that they have teeth in more than one shape (there are up to five shapes of tooth in a horse's mouth), and have two successive sets of teeth, the deciduous ("baby teeth") and permanent sets. As grazing animals, good dentition is essential to survival. Continued grazing creates specific patterns of wear, which can be used along with patterns of eruption to estimate the age of the horse. Types of teeth A fully developed horse of around five years of age will have between 36 and 44 teeth. All equines are heterodontous, which means that they have different shaped teeth for different purposes. All horses have twelve incisors at the front of the mouth, used primarily for cutting food, most often grass, whilst grazing. They are also used as part of a horse's attack or defence against predators, or as part of establishing social hie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Napping Colt
A nap is a short period of sleep, typically taken during daytime hours as an adjunct to the usual nocturnal sleep period. Naps are most often taken as a response to drowsiness during waking hours. A nap is a form of biphasic or polyphasic sleep, where the latter terms also include longer periods of sleep in addition to one single period. For years, scientists have been investigating the benefits of napping, including the 30-minute nap as well as sleep durations of 1–2 hours. Performance across a wide range of cognitive processes has been tested. Benefits Sara Mednick conducted a study experimenting on the effects of napping, caffeine, and a placebo. Her results showed that a 60–90-minute nap is more effective than caffeine in memory and cognition. Power nap A power nap, also known as a Stage 2 nap, is a short slumber of 20 minutes or less which terminates before the occurrence of deep slow-wave sleep, intended to quickly revitalize the napper. The power nap is meant to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Equine Dentistry
Equine dentistry is the practice of dentistry in horses, involving the study, diagnosis, prevention, and treatment of diseases, disorders and conditions of the oral cavity, maxillofacial area and the adjacent and associated structures. The practice of equine dentistry varies widely by jurisdiction, with procedures being performed by veterinary physicians (both in general and specialist practice), specialist professionals termed equine dental technicians or equine dentists, and by amateurs, such as horse owners, with varying levels of training. In some jurisdictions, the practice of equine dentistry, or specific elements of equine dentistry, may be restricted only to specialists with specified qualifications or experience, whereas in others it is not controlled. History Equine dentistry was practiced as long ago as 600 BCE in China, and has long been important as a method of assessing the age of a horse. This was also practiced in ancient Greece, with many scholars making notes ab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vestigial
Vestigiality is the retention, during the process of evolution, of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species. Assessment of the vestigiality must generally rely on comparison with homologous features in related species. The emergence of vestigiality occurs by normal evolutionary processes, typically by loss of function of a feature that is no longer subject to positive selection pressures when it loses its value in a changing environment. The feature may be selected against more urgently when its function becomes definitively harmful, but if the lack of the feature provides no advantage, and its presence provides no disadvantage, the feature may not be phased out by natural selection and persist across species. Examples of vestigial structures (also called degenerate, atrophied, or rudimentary organs) are the loss of functional wings in island-dwelling birds; the human vomeronasal organ; and the hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
