Sir Freddie the ram's 50-year-old frozen sperm used to produce offspring

Australian researchers believe it is the oldest viable stored semen of any species in the world

Decades after his 1960s heyday, Sir Freddie the ram has sired offspring from beyond the grave in what researchers believe is a project that shows the world's oldest viable stored semen.

A team at the University of Sydney has defrosted Sir Freddie's 50-year-old semen and that of three other rams and successfully impregnanted it in 34 merino ewes.