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When Curra, one of the few remaining female southern white rhinos, died after her enclosure at Ol Pejeta Conservancy in Nairobi was flooded last November, environmentalists were gutted.
But despair turned to hope when it was discovered that she had been pregnant following a breakthrough IVF treatment earlier in the year. Her tragic loss has now sparked hope for this threatened subspecies of rhino.
A couple of months earlier, scientists with the BioRescue consortium implanted the 13-year-old southern white rhino, with two southern white rhino embryos, hoping that she would become a surrogate mother. Never before had a rhino been impregnated via in vitro fertilisation.
DNA analysis confirmed that the pregnancy was indeed the result of the embryo transfer, making it the world’s first IVF rhino pregnancy. This was particularly exciting as scientists realised that this could spark hope for another rhino species – the nearly extinct northern white rhino.
Only two northern white rhinos remain on earth, both female. The last male, Sudan, died in 2018, leaving the rhino subspecies doomed to extinction.
Photographer Ami Vitale, who has been documenting the rhinos’ plight for 15 years now, is excited about what the future may hold. “It’s almost like a miracle,” she said.
“The northern white rhinos are just gentle, hulking creatures. They’re sweet. They grew up in a zoo. They’re not wild.”
Najin and Fatu are the two remaining northern white rhinos living at Ol Pejeta Conservancy and are cared for, and protected, around the clock by armed workers. Both rhinos are unable to serve as surrogates due to a variety of medical conditions, but BioRescue, the NGO working to rescue the northern white rhino, intends to use southern white rhinos like Curra as surrogates.
It believes the two subspecies share enough similarities to work, and after Curro fell pregnant following IVF, this hope is alive and well.
BioRescue has been producing northern white embryos using Fatu eggs and sperm gathered and preserved from males before their death. According to Stejskal, the BioRescue project coordinator, there are already 30 northern white embryos, and more are being produced.
“We wanted to prove that our approach works with southern white rhino genetic material, as it is more available,” he said. “By mastering this step, we can now use a northern white rhino embryo for the first time.”
The research team now hope to implant the southern white females with northern white embryos in the next six months. A rhino pregnancy lasts 16 months, so if all goes well, we could see a northern white baby born in two to three years.
Although the embryos can be stored in liquid nitrogen for several years, the pair of northern white ladies are not getting younger, so scientists are keen to get going with the last hope of saving the species.
“We will be able to use this technology and this groundbreaking science for other species. We will see, in our lifetime, northern white rhinos roaming the plains of Kenya. I really believe that.”
Wouldn’t that be something?
[source:cnn]
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