Sperm viability in utero

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Avian sperm are stored in the sperm storage tubules SSTs of the hen oviduct for a prolonged period. However, the precise mechanisms by which sperm are kept alive in the SSTs are still not fully understood. The aim of this study was to determine whether exosomes are secreted by SST cells and play a role in the survival of sperm. Utero-vaginal junction UVJ tissue from approximately 50 wk old White Leghorn hens was collected before control group and after intravaginal insemination with seminal plasma SP group or semen AI group. The samples were used to prepare frozen sections and total protein extraction.
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What Happens to Sperm Once They're Inside a Woman?

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Artificial insemination - Wikipedia

That said, my "end hunger" case doesn't hang on the viability of GM crops. A slight change in the structure or activity of a gland, by altering the internal secretion, may produce widespread alterations even in an adult organism; and we have good reason to suppose that, if compatible with viability , such minute changes would have even a greater ultimate effect if they occurred in an embryo. Viability , by which are meant fecundity, longevity and vigour, was low in average. Occlusive disease and the resulting ischemia threaten the viability of the lower limb, particularly in diabetics.
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How Long Do Sperm Live?

If scientists from Mars were to study the human male's reproductive system they would probably conclude that he is destined for rapid extinction. Compared to other mammals, humans produce relatively low numbers of viable sperm — sperm capable of making that long competitive swim to penetrate an unfertilised egg. As many as one in five healthy young men between the ages of 18 and 25 produce abnormal sperm counts.
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There are approximately million sperm in each human ejaculation, but only about 2 million sperm make it into the cervix. Out of the approximately 2 million sperm entering the cervix, only about 1 million make it into the uterus. The rest are stopped by gooey mucus, or swim into dead-end channels inside the walls of the cervix. Out of the approximately 1 million sperm that enter the uterus, only about 10, make it to the top of the organ.
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