Australian researchers say sheep semen frozen for 50 years has been successfully used to inseminate ewes, resulting in more than 30 pregnancies - demonstrating the viability of long-term storage of semen.
from Health24 News https://www.health24.com/Parenting/Fertility/News/breakthrough-sheep-study-shows-frozen-semen-is-viable-50-years-later-20190320
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