article_snippet.sent: In addition, Paul has a low sperm count, which complicates natural and scientific efforts, experts say.
article_snippet.sent: Najin could conceive, but Najin hind legs are so weak, Najin may be unable to support a mounted male.
article_snippet.sent: There has been recorded mating between different pairs over the last few years, but not conceptions," Paul says.
article_snippet.sent: Based on  a recent health examination conducted, both animals have a regular estrus cycle, but no conception has been recorded.
article_snippet.sent: A committee at the conservancy is also looking at various alternative reproduction techniques, including in vitro fertilization.
article_snippet.sent: However, consultations are ongoing amongst different reproductive technique experts on the way forward.
article_snippet.sent: But hopefully, using artificial methods of reproduction, we might be able to bring them back in the future," Paul says.
highlights_snippet.sent: Experts are trying various ways, including in vitro fertilization .