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Sperm in frozen animals still viable years later

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6:08pm, August 29, 2006

Sperm stored inside frozen organs or whole animals can produce healthy offspring years later, a new study shows.

Researchers bank sperm from lab animals and other species that they may want to reproduce in the future. The typical method for storing male sex cells involves dissecting the epididymides—tubes that store sperm in the testes—from dead animals. Researchers remove the sperm, which are then placed in a special preservative solution and plunged into liquid nitrogen.

Because this method can be tedious and costly, Atsuo Ogura of the Institute of Physical and Chemical Research Bioresource Center in Ibaraki, Japan, and his colleagues tried another method. Working with lab mice, the researchers froze epididymides, testicles, and entire animals for periods of 1 week to a year. They also used mice that had been frozen for up to 15 years.

When the researchers thawed the organs or whole animals and removed their sperm, the sex cells could fertilize eggs

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