Poor fertility may be hereditary

Researchers say this offers evidence that fertility problems are at least partly inherited in some cases.

Scientist's reporting in the American Journal of Epidemiology found that men with sub-fertile parents had 22 percent lower sperm concentration and a smaller percentage of structurally normal sperm than men born to parents of normal fertility.

Researchers say that if impaired fertility is passed on from parents it's possible that fertility problems could become more common as more and more infertile couples conceive with the help of assisted reproduction.

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