Australian researchers have inseminated 56 Merino sheep with sperm from the year 1968. 34 the sheep were after insemination, pregnant.
The success rate of 61 percent was about the same, the to recently frozen semen, explain to the scientists from the University of Sydney. "We believe that it is the oldest usable stored sperm of a kind in the world, and in any case, the oldest sperm, the offspring was produced," says biologist Jessica Rickard.
The seeds are donations from the year 1968 came, according to the University of four rams, including "Sir Freddie". They were then frozen using liquid nitrogen at minus 196 degrees Celsius, and now again for the insemination of thawed. "This clearly shows the viability of long term frozen and stored sperm," says Rickards Mr Simon de Graaf.
also Interesting is the insight into the sheep breeding practices of the past. The lambs seemed to have the wrinkled skin that occurred in Merino sheep in the middle of the last century. Breeders have selected these sheep, in order to maximize the surface of the skin of the animals and the wool yield. Later, you will have drained from the practice again, because the folds would have led, among other things, the scissors to problems, explains De Graaf. (sda)
Created: 17.03.2019, 11:29 PM