ear tag


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ear tag

Preauricular tag A common minor skin defect, consisting of a rudimentary tag of tissue, often with central cartilage, usually located just in front of the ear

ear

the organ of hearing and of equilibrium. The ear is made up of the outer (external) ear, the middle ear and the inner (internal) ear. The anatomical parts of all three can be found under their specific names. See also auricular, auditory, external ear.
The outer ear consists of the auricle, or pinna, and the external acoustic meatus. The auricle collects sound waves and directs them to the external acoustic meatus which conducts them to the tympanum.
The tympanic membrane (eardrum) separates the outer ear from the middle ear. In the middle ear are the three ossicles, the malleus (hammer), incus (anvil), and stapes (stirrup), so called because of their resemblance to these objects. These three small bones form a chain across the middle ear from the tympanum to the oval window of the inner ear. The middle ear is connected to the nasopharynx by the auditory tube, through which the air pressure on the inner side of the eardrum is equalized with the air pressure on its outside surface. Two muscles attached to the ossicles contract when loud noises strike the tympanic membrane, limiting its vibration and thus protecting it and the inner ear from damage.
In the inner ear (or labyrinth) is the cochlea, containing the nerves that transmit the electrical impulses stimulated by sound to the brain. The inner ear also contains the semicircular canals, which are essential for the sense of balance. When a sound strikes the ear it causes the tympanic membrane to vibrate. The ossicles function as levers, gearing down the motion of the tympanic membrane, and passing the vibrations on to the cochlea. From there the vestibulocochlear (eighth cranial) nerve transmits the vibrations, translated into nerve impulses, to the auditory center in the brain. See also hearing.

ear alopecia
see pinnal alopecia.
bat ear
an erect, broad-based ear in dogs; seen in the French bulldog and Welsh corgi.
bear ear
one with a very rounded tip.
break in ear
the fold line in the semi-dropped ear of dogs.
broken ear
deformed or misshapen ears, as a result of injury or congenital defect. Most often of concern in dog breeds that are supposed to have erect or specifically defined ear conformation, e.g. Collie, German shepherd dog, Chihuahua.
button ear
in dogs, an ear flap lying close to the head, and pointing toward the eye. Seen in fox terriers.
ear cancer
a squamous cell carcinoma of the ear of sheep. The lesion commences around the free edge and then invades the entire ear.
ear canker
a lay term applied generally to otitis externa but sometimes specifically to that caused by ear mites.
ear carriage
drooped, erect, alert, all indicative of mental state or state of muscle tone. Also a specified feature of breed standards for dogs.
ear cartilage
see auricular cartilage.
ear chewing
a vice of confined pigs due largely to boredom and overcrowding.
ear cyst
a misplaced tooth germ or ear tooth in horses; occur unilaterally at the base of the ear, attached to the temporal bone. Called also heterotopic polyodontia.
drop ear
an ear that is normally not erect; the end folds over or droops forward. Seen in many dog breeds.
drooping ear
inability of the ear to remain in an upright position in those species in which that is the norm. It may be a congenital abnormality, due to injury that has damaged the cartilage, or a sign of neurological deficit.
ear hematoma
see auricular hematoma.
ear mange
ear margin dermatosis
crusts, scabs and sometimes ulcerations, may occur at the edges of the external ear flap in dogs. Usually a form of seborrhea.
ear mark
patterned pieces of cartilage punched out as a means of identification. Very popular at one time with intricate codes to identify age and family groups of pigs. Marks nicked out of the edges but also the centers of the ears.
ear mites
see psoroptescuniculi, raillietiaauris, raillietiacaprae.
ear notch
see ear mark (above).
ear pinna
see pinna.
ear plaque
hypertrophic dermatitis appearing as small (0.5 inch diameter) plaques on the inner surface of the ear pinna in horses. They are scaly, slightly papillomatous, painless and alopecic. The cause is unknown.
ear points
see auricular points.
ear punch
alligator forceps with cup-shaped opposing blades up to 1.5 inch diameter. A biopsy instrument for use in the depths of the ear canal.
ear resection
see lateral ear resection, vertical ear canal resection.
ear rigid
ear pricked and patient unable to move them; indicative of general skeletal muscle tetany.
ear sloughing
result of phlebitis and venous thrombosis occurring in many septicemias. It is most common in pigs where it begins as purple discoloration of the ears and surrounding skin. Also part of the response in peripheral gangrene syndrome caused by ingestion of the fungus clavicepspurpurea.
spinose ear tick
see otobiusmegnini.
ear sucking
a vice occurring in penned pigs and calves caused by boredom. Has no serious effect unless it leads to cannibalism in pigs.
ear tag
a technique of animal identification favored in sheep and cattle. Has the disadvantage that tags are often lost. This can be avoided by putting duplicates in each ear. The need to catch the animal to read the tag is overcome by using large placard type tags. For cattle being worked through a chute, tail tags are more convenient. Insecticides can be incorporated into the tag to provide protection against horn fly and head fly. May contain transponders for individual identification or trace back.
ear tick
see otobiusmegnini.
ear tipping
clipping off the tip of the external ear so that the animal can be identified from a distance. Limited categories available.
ear tip necrosis
a common problem in individual pig herds; sporadic cases usually related to frostbite, thrombosis after septicemic disease, especially Salmonella dublin in young calves; herd problems may be due to ergot poisoning or endophyte-containing hay, or an ear-sucking habit.
Enlarge picture
Ear tip necrosis in a calf associated with Salmonella dublin infection. By permission from Blowey RW, Weaver AD, Diseases and Disorders of Cattle, Mosby, 1997
ear tooth
ear trimming
ear twitch
a rope twitch is twisted onto an ear instead of the muzzle.
References in periodicals archive ?
Besides, this UHF ear tag can be printed with a customized logo and sequence number for different kinds of livestock tracking choice.
What's more, since each animal ear tag has its unique ID number, livestock owners can easily get the animal's information, such as feeding, location, vaccination, etc.
The Badger Trust said it was now clear that the practice of switching ear tags to foil bovine TB (bTB) controls was commonplace and not isolated, as first claimed.
The radio frequency identification device ear tag is already used in some speciality sales.
A FATHER and son involved in a BSE scam were caught after DNA discovered on a cow's ear tag was found to belong to another animal.
Game wardens take the bears ``to the backcountry and put an ear tag on them just to keep track of them,'' he said.
Some will have a green left ear tag marked 105607 and some have both left and right ears tagged.
Lee Reynolds, prosecuting for Powys County Council, said that there were about 200 milking cows on the 400-acre farm and during TB testing in 2009 ear tag discrepancies were discovered.
Brian Bolton, president and CEO of Allflex USA, the largest manufacturer of physical and electronic animal identification tags in the world, estimates 60 percent of all cattle in the United States wear an ID ear tag at some point in their production lives.
ANIMAL ID supplier Quicktag has announced expansion plans with ear tag manufacturer Datamars.
NASDAQ: KMGB), a global provider of specialty chemicals in carefully focused markets, today provided an update on the successful launch its new AVENGER([R]) insecticide cattle ear tag.
Most farmers will be blood-testing calves between six and nine months of age, at which point the mother is already back in calf, which defeats the object of the exercise," said Scott Brown, from Murray Farm Care, suppliers of the TypiFix ear tag package.