Parallel efforts to implant reproductive cells created from stems into females are also under way. It could take decades to have a reasonable number of babies.” Then, attention will shift to letting them loose sustainably in the wild, the “ultimate goal”.
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His associates in Italy have been able to make embryos and now they are fine-tuning how to impregnate the surrogates. Within four years, a northern white rhino could be born from the embryo method, says Stejskal. So Hildebrandt and colleagues, coordinated by Stejskal, stepped up efforts to collect eggs and sperm.Īrt reflecting life: a digital northern white rhino at the Lost Rhino exhibition. Previous efforts to insert hormonal implants or artificially inseminate females failed, as did transporting the last two males and females to Kenya where it was hoped they would be more likely to breed. “This is completely cutting edge in terms of endangered species,” says Jan Stejskal, the international projects director at the Dvůr KrálovFé zoo in the Czech Republic, where the last northern whites were born. Eggs have also been collected from the last reproductive female rhino thanks to a team led by Thomas Hildebrandt, head of reproduction management at the Leibniz Institute for Zoo and Wildlife Research. It is stored in a cryogenic tank in liquid nitrogen at a laboratory on the outskirts of Berlin. Around 300ml of semen from Sudan and four other males, who he outlived, was collected over 15 years thanks to a variety of methods to arouse the animals, including one scientist jumping on the last male’s back. Scientists who collected semen and eggs from the last living members of the rhino species hope to be able to implant embryos into a cousin of the northern white rhino as part of nascent repopulation efforts which, if successful, would be unprecedented.
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