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sperm motilityA parameter assessed in semen analysis that consists of the ability of sperm to swim in a forward direction. Per the WHO, 60% is the lower reference limit for motility, assuming a lower limit of 20 million sperm cells per milliliter.
the male germ cell. See also spermatozoon.
anti-sperm antibodies of the IgG class occur as autoantibodies in dogs infected with Brucella canis.
acquisition of the capacity to penetrate an ovum, not present at the time of delivery of the spermatozoon, and which requires a period of incubation in the female tract. It involves increased metabolic activity and motility and the removal of a chemical decapacitation factor from the spermatozoon. Capacitation must take place for the acrosome reaction to occur.
a sperm count as measured in a hemocytometer; an indication of the health of the relevant testicles and a guide to the prospective fertility of the ejaculate and the donor.
sperm live-dead ratio
an indicator of the viability of the ejaculate as expressed in a slide count of a specially stained smear of the semen in which the dead and live sperm can be distinguished because of their differential staining.
the normal anatomical structure of the spermatozoon. Abnormality of the structure of individual spermatozoa is used as a guide to the location and nature of the disease causing reduced reproductive efficiency.
the percentage of spermatozoa moving actively forward. Assessed under the microscope (400 × magnification) or by computerized imaging. See also wave motion; used to predict the probable fertility of the ejaculate.
sperm motility index
half the sum of the sample's sperm percentage motility + sperm progressive motility.
sperm penetration assay
see ovum penetration assay.
hard bodies composed of inspissated masses of spermatozoa found in dilated remnants of epididymal ducts and produced by chronic epididymitis.
within both male and female reproductive tracts some movement forward results from the movements of the spermatozoa but most progress is the result of peristaltic movements by the tubular organs in which the spermatozoa find themselves at the time.