Najin, one of the world's last northern white rhinos, retires from breeding

Hopes that mankind can save the northern white rhino from extinction appeared more remote than ever this week, after scientists announced they will retire one of the last two living northern white rhinos from a breeding program.

Najin, a 32-year-old northern white rhino — WHO, along with her daughter Fatu is one of only two left in the worldwill no longer be harvested for eggs for “道德的” 原因, the team of researchers from the BioRescue consortium announced in a press release Thursday.
Rhinos are targeted by poachers, fueled by the belief in Asia that their horns cure various ailments. 结果是, the northern white rhino subspecies is on the brink of extinction.
    Najin, who was born at a safari park in Czech Republic in 1989, was moved to the Ol Pejeta Conservancy in Kenya in 2009 as part of a breeding program to revive the population.
      Fatu, pictured here in July at the  Ol Pejeta Conservancy, is now the last white rhino in the breeding program.

      She was moved there with her daughter, Fatu, along with the world’s last two male northern white rhinos — 谁死于 2014 和 2018.
        After the males died the breeding program continued with sperm harvested from the males. The scientists then harvest the femaleseggs before fertilizing them in a laboratory.
        然而, neither Najin nor Fatu have been able to carry a pregnancy to full term.
          研究人员, led by the Leibniz Institute for Zoo and Wildlife Research in Germany, said in the press release that they had made theexceptionally difficultdecision having undertaken anin-depth ethical risk assessment.
          Oocyte [ovary cell] collections in Najin have yielded only few eggs and none of them could be fertilized successfully to become an embryo.
          Weighing this outcome with potential risks, it is the most responsible decision to cease any further intervention on Najin and to stop using her as a donor of oocytes,” they said in the press release.
          She will remain a part of the program, for example by providing tissue samples for stem cell approaches, which can be performed with minimal invasion.
            The researchers added that they had found multiple small, benign tumors on her reproductive organs.
            The retirement of Najin from oocyte collections leaves just one living northern white rhino left in the breeding programher daughter, Fatu, who is more than a decade her junior.

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