World's oldest frozen ram semen successfully used in sire evaluation program

By Lucy Kinbacher
Updated February 21 2019 - 1:42pm, first published 1:07pm
Sir Fred born in 1959 is one of four rams who contributed to the pool of semen frozen in 1968.
Sir Fred born in 1959 is one of four rams who contributed to the pool of semen frozen in 1968.

The world’s oldest frozen ram semen is still achieving high fertility rates despite being put on ice 50 years ago. 

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