horn fly(redirected from Haematobia irritans)
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Related to Haematobia irritans: horn fly
A small dark-gray fly (Haematobia irritans) that sucks blood from cattle, often biting around the base of the horns.
members of the order Diptera. See black fly, blowfly, bot fly, chrysops, cnephia, cordylobia, cuterebra, eristalis, flesh flies, haematobia, hippobosca, hydrotoea, hypoderma, musca, phormia, pigeon fly, sandfly, screw-worm, simulium, stomoxys calcitrans, tabanus, torsalo grub, tsetse, warbles.
a mushroom. See amanita.
fly biting, fly catching
behavior by dogs that looks like an attempt to catch a nonexistent flying object, hence the name. When repeated or continual, believed to be a form of partial seizure or hallucinations.
limitation of fly population by disposal of rotting animal tissue, use of insecticides in sprays, back applicators, impregnated ear tags or pet collars, liberation of sterilized males, fly traps.
biting flies will inflict skin damage on the face and particularly ear tips of outdoor dogs, causing bleeding, dried crusts and moderate irritation that sometimes leads to the development of auricular hematomas. Also reported to be a common problem in zoo bears.
ear tip fly bite
see fly dermatitis (above).
see stomoxys calcitrans.
all fly infestations cause worry to their host animals. Heavy infestations with black flies in horses and buffalo flies in cattle may cause deaths from worry, blood loss, interference with grazing and intercurrent disease. See also fly dermatitis (above).
1. a pointed projection.
2. the processes carried on the foreheads of most ruminants and rhinoceroses including skin-covered bony knobs in giraffes, velvet-covered branched deciduous bony antlers of deer, branched deciduous keratinized processes in pronghorns and the familiar hollow horns of bovids. In these a horny sheath is composed of keratinized epithelial cells borne on a fibrous corium that is carried on a cornual process, an extension of the frontal bone. In mature cattle the cavity of the frontal sinus extends into the cornual process. Called also fighting horns.
Cattle and buffalo horns are classed as shorthorn (short, in-curving), lyre (see lyrate), crescent or sickle (large, inward curving, downward inclined), long (long, handlebar configuration).
telling the age of a cattle beast by counting the rings at the base and adding one. Can give a guide but can also mislead. It is also capable of being faked and even obliterated by rasping or by dehorning.
immature horn on the frontal bone of very young ruminants. Called also horn bud.
horn core cancer, horn cancer
is a squamous cell carcinoma of the mucosa of the frontal sinus which invades the horn core usually resulting in dehiscence of the horn. Has a very high prevalence in adult male cattle in India.
a hard, dry outgrowth from a cicatrix, commonly scaly and rarely osseous.
single or multiple firm projections ('horns') of keratin on the skin or footpads. They may originate from papillomas, keratoses or various skin tumors, particularly intracutaneous cornifying epithelioma, or in association with dermatophilosis or feline leukemia virus infection.
dorsal horn of spinal cord
the horn-shaped structure seen in transverse section of the spinal cord, formed by the dorsal column of the cord.
horn nerve block
see cornual nerve block.
malaligned shorthorn type horns which curve in too far and penetrate the skull, usually into a frontal sinus.
made of hoof raspings mixed with lard. Packed into the clefts beside the bars of the sole in the horse's foot before the taking of a radiograph; avoids the misleading opacities created by the clefts on radiographs. Now usually replaced by Playdo.
microscopic structures found in some neoplasms of epithelial origin. Called also squamous or keratin pearls.
a hard outgrowth of the contents of a sebaceous cyst.
devices used for removing horns. Most work as a guillotine and provide great leverage for cutting the horns at the base where a rim of skin can be included.
basic structural element in many horny outgrowths; produced by a dermal papilla, it bears some resemblance to a hair and grows approximately vertical to the dermal surface; it is united by intertubular horn to neighboring tubules.
ventral horn cell diseases
motor neuron diseases; rare in animals, but hereditary spinal muscular atrophy of Brittany spaniels is an example.
ventral horn of spinal cord
the horn-shaped structure seen in transverse section of the spinal cord, formed by the ventral column of the cord.
a hard, pointed outgrowth of a wart.