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sperm frozen for a year, Rickard says. In that time, weve been trying to make better, more productive sheep, he said. This gives a pregnancy rate of 61 percent for the 50-year-old semen against 59 percent for recently frozen sperm, a statistically equivalent rate. That style of Merino has since largely fallen from favor as the folds led to difficulties in shearing and increased risk of fly strike. So, apparently, avid sweater-wearers can rejoice.
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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, says Simon de Graaf, an associate professor at the University of Sydney. Rickard did the original work to determine if the stored semen was viable for artificial insemination. We believe this is the oldest viable stored semen of any species in the world and definitely the oldest sperm used to produce offspring, says researcher Jessica Rickard, a post-doctoral fellow at the Institute of Agriculture and School of Life. This sperm may have come in like a lamb but its out like a lion. This involved thawing the donations of Sir Freddie the ram, which is stored in small pellets kept at -196 degrees in large vats of liquid nitrogen. We can now look at the genetic progress made by the wool industry over past 50 years of selective breeding. A highly fertile one. This compares to recently frozen semen from 19 sires used to inseminate 1048 ewes, of which 618 were successfully impregnated.