Lambs born from 50 year old semen

Ram sperm frozen for 50 years has been successfully used to impregnate 34 ewes. This was shown by Australian researchers. Semen stored since 1968 in a laboratory in Sydney has been defrosted and successfully used to impregnate 34 Merino ewes, with the resulting live birth rate as high sperm frozen for just 12 months. “This demonstrates the clear viability of long-term frozen storage of semen. The results show that fertility is maintained despite 50 years of frozen storage in liquid nitrogen,�