Dr Gruber expects to have a commercial sperm-sorter ready next year, and Arryx has already signed a deal to deploy it with a British dairy.
Reproductive cloning, which created Dolly the sheep in 1997, involves transferring the nucleus of an adult cell into an egg, giving the resulting embryo a full set of genes without the normal sperm-meets-egg fertilisation step.
To confirm that this is so, Ms Welch stripped the eggs out of several females (not as horrible a process as it sounds), divided each batch of eggs into two, and inseminated half with sperm from a long-calling male and half with sperm from a short-calling male.
Many parents who chose not to tell were concerned, she said, that they would be able to give relatively little information about the biological parent - as sperm donation is carried out on an anonymous basis.
"It is true that future fertility techniques may well be able to help a sterile or near-sterile child reproduce but that may be an outcome that parents do not want to risk and they may instead turn to a known-to-be-fertile sperm donor, " he said.
Those who spent lots of time watching TV or DVDs - at least 20 hours a week - had a sperm count that was 44% lower than men who spent little time in front of the box.
In the fullness of time, perhaps men will think likewise and have some of the sperm of their carefree, mutation-free youths frozen in case they fancy a little procreation in their old age.
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Even more radical was the invention, in 1978, of in-vitro fertilization, or IVF, the now-common technique in which egg and sperm meet in a laboratory petri dish and create an embryo that is then implanted in the would-be mother's womb.
The sighting of sperm whales off Scotland's north-west coast in winter has been described as "extraordinary" by research charity Sea Watch.
Racers wax their boards with an old-fashioned preparation called "dope, " whose original recipe called for spermaceti--a fatty substance produced by sperm whales.
At the moment, would-be parents are offered a sperm "washing" technique prior to insemination, which removes cells and other detritus which can harbour the virus.
However, they were identified as sperm whales by Nick Davies, who runs Gairloch-based Hebridean Whale Cruises and is involved in a Sea Watch project.
Other images on show include a pygmy seahorse camouflaging itself among coral, a sperm whale investigating the photographer, and a bee-eater bird catching a dragonfly for his mate.
They identified two genes - zipper and lgl - which they found worked together to change the make up of sperm cells, making it impossible for them to fertilise uninfected eggs.
While the study took into account factors that can affect sperm quality, such as age, researchers were unable to control for socio-economic factors, smoking or weight, which have been shown to have a major impact.
At the University of Sheffield, where Mossman did his doctoral studies, he and his co-authors measured the heads, midpieces, and flagella of 30 sperm per man, from 103 men randomly selected from a pool of about 500 who were recruited for a larger fertility study.
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With human cloning technology just around the corner and enough frozen sperm in the world to already populate many generations, perhaps we should perform a cost-benefit analysis.
My attention was drawn to this market by a review at the Feminist Law Professors Blog on the newest book in the gamete-trade, Sex Cells: The Medical Market for Eggs and Sperm.
After that point, as word slowly spread, doctors began to quietly experiment with artificial insemination with donor sperm, working only with infertile heterosexual couples, turning to friends of the couple or -- once again -- their medical students.
She suggested that children born through donated sperm might be told in simple terms as soon as they could broadly understand the concept, perhaps even before school-age.
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