Tandem Selection– Selection for one trait for a given period of time followed by selection for a second trait and continuing in this way until all important traits are selected.…
Sigmoid Flexure
Sigmoid Flexure– The s-shaped curvature of the penis when it is retracted in the body. During sexual excitation, and erection, the sigmoid flexure disappears when the penis straightens.
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Reciprocal Recurrent Selection
Reciprocal Recurrent Selection– The selection of breeding animals in two populations based on the performance of their offspring after animals from two populations are crossed.…
Pregastric Fermentation
Pregastric Fermentation– Fermentation that occurs in the rumen of ruminant animals. It occurs before feed passes into the portion of the digestive tract in which digestion actually occurs.…
Postgastric Fermentation
Postgastric Fermentation– The fermentation of feed that occurs in the cecum, behind the area where digestion has occurred.…
Pin Bones
Pin Bones– In cattle, the posterior ends of the pelvic bones that appear as two raised areas on either side of the tail head.
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Volatile Fatty Acids (VFA)
Volatile Fatty Acids (VFA)– A group of fatty acids produced from microbial action in the rumen.
Examples of VFA’s:
- acetic acid
- propionic acid
- butyric acid
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Vasectomy
Vasectomy– The removal of a portion of the vas deferens. As a result, sperm are prevented from traveling from the testicles to become part of the semen. If the vas deferens are the only tissues cut, the testicle …
Vagina
In Mammals: The vagina is the copulatory portion of the female’s reproductive tract. The vestibule portion of the vagina also serves for passage of urine during urination. The vagina also serves as a canal through which young pass when born.…
Parity-beef cattle
Parity– Number of different times a female has had offspring.
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