Sperm mouse

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These mice, each about 12 months old, were born from eggs fertilized with artificial spermatids made in a dish, Chinese scientists say.So goes a common belief, which asserts that sperm with Y chromosomes—those make male babies—swim faster, so you have a better chance of having a daughter if the sperm has to travel a long way to the egg.But although millions of babies have now been born by IVFthe technique can offer no help to couples eager to have a child that is genetically theirs but who lack the eggs or sperm to make it: men whose testes produce no sperm, say, or women who have undergone surgery for ovarian cancer.All rights reserved.By Alice Klein.Poor sperm quality is the major cause of infertility in humans.

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Eat poorly, and your body will remember—and possibly pass the consequences onto your kids.

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In the animal world, if several males mate with the same female, their sperm compete to fertilize her limited supply of eggs.Sperm morphology is assessed routinely as part of standard laboratory analysis in the diagnosis of human male infertility.

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