Poultry Science Terminology - V

V-Shaped comb: comb consisting of two horn-like pieces that are joined at the comb base

Vaccination: introduction of a vaccine into the body for the purpose of inducing immunity

Vaccine: product made from disease-causing organisms and used to produce immunity

Vagina: section of the female avian reproductive tract where the bloom (cuticle) is added to the egg just prior to being laid 

Value-added product: further processed to maximize consumer appeal

Variety: subdivision of a breed, distinguished by plumage color, comb type, and beard or leg feathering 

Vas deferens: passageway for sperm from testicles to the cloaca, in birds also used for sperm maturation and storage

Vascular: pertaining to blood vessels

Vasoconstriction: narrowing of the blood vessels, conserves body heat

Vasodilation: widening of blood vessels, used by animals to passively dissipate body heat

Vector: means by which a disease is spread; living thing that carries disease organisms within its body from one source to another including: mosquitos, ticks, and flies

Vehicle: anything that mechanically carries disease organisms from one place to another including clothing, equipment, and dust)

Venipuncture: inserting a needle into a vein for the purpose of drawing blood

Vent: common external opening of the cloaca for the digestive system in birds through which the digestive, excretory, urinary, and reproductive tracts empty 

Ventilation: movement of fresh air into and stale air out of housing

Ventriculus: mechanical stomach in birds, grinding mechanism for food digestion; gizzard

Vertebrae: bones in the spinal column

Vertical integration: control by a single company of most of all aspects of production

Vertical transmission: disease transmitted from parent to offspring through hatching eggs 

Veterinary ethology: study of animal behavior as it relates to health

Viremic: pertaining to a virus in the blood

Virulence: strength of pathogenicity a disease-causing organism has to cause a disease 

Virus: complex protein material that is capable of causing disease which can be reproduced only inside that living cells

Viscera: internal organs and glands

Viscous: thick and sticky

Vitamin: organic compound that is fat- or water-soluble substance and is necessary, in very small amounts, for normal growth and maintenance of life. It is often added to poultry water or sprinkled over feed many physiological processes

Vitamin/mineral premix: A concentrated source of various vitamins and/or minerals mixed together so as to make the adding of them to the diet much easier (beware of antagonistic materials)

Vitelline membrane: thin membrane that surrounds the yolk

Vulture hock: feather-legged breeds where the feathers grow off the shank and touch the ground 



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