Cloning to the rescue

日期:2017-06-07 05:19:39 作者:牛浣 阅读:

A disappearing breed of New Zealand cattle has been given a new lease of life, thanks to cloning technology. In 1992, a cow named Lady and some frozen bull semen were all that was left of the Auckland Island breed. Making Lady pregnant with the sperm proved difficult. So David Wells of the Ruakura Research Centre in Hamilton fused cells from Lady’s ovaries with eggs from other cattle which had their own genetic material removed,