frozen semen

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frozen semen

Semen collected, analyzed and stored at −196°F (−90°C) for future use in artificial insemination by clinics specializing in infertility. In artificial insemination the number of successful pregnancies is lower with frozen semen than with fresh.
See also: semen


said of material kept at less than 0°C. Biological materials are frozen solid because of their high water content.

frozen embryo
see embryo transfer.
frozen meat
meat preserved at low temperatures in a freezer.
frozen section
a specimen of tissue that has been quick-frozen, cut by microtome, and stained immediately for rapid diagnosis of possible malignant lesions. A specimen processed in this manner is not satisfactory for detailed study of the cells, but it is valuable because it is quick and gives the surgeon immediate information regarding the malignancy of a piece of tissue.
frozen semen
see semen.


fluid discharged at ejaculation in the male, consisting of spermatozoa in their nutrient plasma, secretions from the prostate, seminal vesicles and various other glands, epithelial cells and minor constituents.

semen collection
for artificial insemination or laboratory evaluation or examination in a clinicopathological sense. Done by artificial vagina, electroejaculation, genital massage.
semen concentration
the number of spermatozoa per ml in the ejaculate.
semen diluent
there are a number of suitable diluents with some preference being given to one or other of them in each species. There are also different diluters for chilled liquid semen as distinct from frozen semen. Most diluters are based on biological fluids such as whole or skim milk, buttermilk, cream and egg yolk. The general cryoprotectant for freezing is glycerol. Called also semen extender.
semen extender
see semen diluent (above).
frozen semen
semen stored in liquid nitrogen at −196°C (−321°F).
semen non-sperm portion
see semen pre-sperm fraction (below).
semen pre-sperm fraction
the accessory gland fluid emitted at the beginning of ejaculation.
semen samples
part of an ejaculate collected for laboratory examination.
semen sperm-rich fraction
the portion of the ejaculate containing most of the spermatozoa.
semen stones
concretions of amorphous cellular debris and clumps of nuclear material found in seminal vesicles of bulls.
semen storage
chilled bull semen stored at 5°C can be stored and used for 5 days; frozen bull semen (−79°C using dry ice or −196°C using liquid nitrogen) can be stored and used successfully for up to 10 years, with only a small drop in fertility after 40 years.
References in periodicals archive ?
Laboratory provides frozen semen to local physicians who are dealing with couples trying to achieve pregnancy through A.
1hh dapple grey stallion Silver Jasper), was bred by using frozen semen.
Could the process be exploited and the frozen semen of a long-dead sporting hero or celebrity be used to create a designer baby?
In March, the lawsuit says, Lafferty learned the breeding privileges from that horse and two other stallions would be in the form of frozen semen.
Richard Lutwyche, publicity manager of the Rare Breeds Survival Trust in Stoneleigh Park, Warwickshire, said there are units across the country which have stores of frozen semen from all rare breeds of cattle and pigs.
It was also confirmed that an investigation is under way after a van carrying a consignment of frozen semen straws was stopped by Gardai at Castleblaney.
Aliquots of frozen semen with known post-thaw motility may be used for QC.
A human sperm shortage in Canada, caused by new rules for donor screening, has forced physicians to look south of the border for frozen semen for artificial insemination, according to fertility specialists.
antibiotics, public hearings, hormones, frozen semen, and Kawasaki quarter horses.