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Most fertility research has focused on the size of sperm and the size of the swimmers' heads, but a new study suggests the variability in the length of sperm also may put a wrench in successful reproduction. Like a factory churning out products of inconsistent sizes, ejaculates with varying sperm lengths can be a problem, said James Mossman of Brown University in Rhode Island. And his study suggests a link between this variability and sperm quantity. This suggests those with less variation produce higher concentrations of good sperm. Mossman and his colleagues, who detailed their results in the Oct. The researchers examined semen provided by men who enrolled in a fertility study in

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Sperm Hoarders: Why Animals Store Semen

All you ever wanted to know about boar semen. | The Pig Site

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Inside the Strange World of Harvesting Sperm From Dead Guys

Boar semen is a suspension of sperm cells and secretions from the boar reproductive tract, including the accessory glands. The fluid portion of this suspension is known as seminal plasma and it helps to carry and protect the sperm cells. In boars, the semen also contains large quantities of gel. It takes about five weeks for a sperm cell to be produced, and a further two weeks to go through the epididymis [The epididymis is a long, convoluted tube just outside the upper surface of the testis, where the sperm migrate slowly while continuing to mature and gain the potential ability to fertilise the eggs.

In the late s, urologist Cappy Rothman performed the first post-mortem sperm retrieval. Before this, Rothman had been extracting sperm from men living with infertility, work that gave him a detailed knowledge of male reproductive anatomy, experience in sperm extraction and preservation, and contacts who knew he was interested in assisting men with reproductive issues. He had quickly become known in Los Angeles. Then, when a prominent politician's son was left brain-dead after a car accident, "I got a call from the chief resident of neurosurgery at UCLA and he said, 'I have a strange request.