Additional cryoprotectants can be used to increase sperm viability and fertility rates post-freezing.
2.
Surprisingly, sperm viability was not affected by any change in diet or diet ratios.
3.
It is postulated that it is to maintain sperm viability, which drops off at cooler temperatures.
4.
Incorporation of cholesterol into sperm cell membranes with the use of cyclodextrins prior to freezing also increases sperm viability.
5.
It s hypothesized that sperm viability is more affected by the genetic makeup, like in the " good sperm hypothesis ".
6.
These contraceptives inconsistently inhibit ovulation in ~ 50 % of cycles and rely mainly on their progestogenic effect of thickening the cervical mucus and thereby reducing sperm viability and penetration.
7.
Transit times may vary and these have a significant effect on sperm viability so that if a donor is not located near to a recipient female the sperm may deteriorate.
8.
However, a man with estrogen insensitivity syndrome ( a defective ER? ) was found produce sperm with a normal sperm count, albeit abnormally low sperm viability; whether he was sterile or not is unclear.
9.
The damage, the researchers said, included a reduced ability of sperm to penetrate an egg, changes to the genetic material in sperm, poor sperm viability and, in the case of St . John's wort, mutation of the tumor suppressor gene, BRCA1, a change that can increase the risk of breast and ovarian cancers in women who inherit the mutated gene.
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