According to, "Scientists in Australia have set a new record by using the world's oldest known viable semen to impregnate dozens of merino sheep. The sperm had been frozen since 1968, but the live birth rate was as high as when using semen frozen for 12 months." Simon de Graaf, an associate professor at the University of Sydney's Institute of Agriculture, "The birth of these lambs clearly demonstrates that artificial insemination with frozen semen is a safe and reliable reproductive technology now and into the future..."

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