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ART in Wildlife Conservation
CREW is using the power of science to help endangered cats around the world. Through assisted reproductive technologies like artificial insemination, in vitro fertilization, and embryo transfer, researchers can preserve valuable genetics, support breeding programs, and give new hope to species that are struggling to survive. These innovations are helping to grow healthy wild cat populations and ensure that future generations will continue to thrive.
Key Assisted Reproductive Technologies
Involves collecting sperm from a male and depositing it into a female’s reproductive tract to achieve fertilization.
CREW in Action: CREW scientists pioneered a breakthrough laparoscopic oviductal AI (LOAI) technique that places sperm closer to the natural site of fertilization. This approach dramatically improves pregnancy success, often using only very small numbers of sperm. With LOAI, CREW has produced term pregnancies in six wild cat species, including the sand cat, Pallas’ cat, fishing cat, ocelot, tiger, and the first jaguar cub ever born through assisted reproduction. This milestone demonstrates the power of reproductive science to help secure the future of imperiled cat species.
Involves collecting sperm from a male and eggs from a female, then putting them together in a lab dish to allow fertilization and create an early embryo, which can then be transferred into a surrogate mother.
Involves depositing an early embryo into a surrogate female so it can implant in her uterus and be carried to term.
CREW in Action: CREW scientists are demonstrating the power of combining IVF and embryo transfer for conservation. For ocelots, CREW and collaborators in the U.S. and Brazil have achieved five pregnancies and five healthy kittens from frozen-thawed IVF embryos. The approach has also produced two sand cat kittens in the United Arab Emirates using fresh IVF embryos. By creating healthy embryos in the lab, researchers can safeguard rare genes and strengthen future populations.
Cryopreservation is the process of freezing sperm, eggs, embryos, and other genetic material at extremely low temperatures to preserve their viability for future use. When these frozen samples are systematically collected and maintained long-term, they form a Genome Resource Bank that secures essential genetic material for future conservation work
CREW in Action: CREW stores essential genetic material from 30 felid species within liquid nitrogen tanks in their CryoBioBank®. Using frozen-thawed sperm from this collection, scientists recently produced two litters of ocelot kittens through LOAI from the population’s most genetically valuable male, who had never reproduced naturally.
How ART Helps Wildlife Conservation
Protect genetic diversity: ART can move valuable genetics between isolated populations through the transport of sperm or embryos, helping to prevent genetic bottlenecks and inbreeding.
Incorporate genes from free-ranging animals without removing them from the wild: Semen collected from wild founders can be banked and used later to infuse valuable new genetics into zoo populations, without removing more cats from their natural habitats.
Extend the impact of each individual: Frozen sperm and embryos make it possible for an animal’s genes to contribute to future generations long after its lifespan, helping maintain genetic diversity over time.
Boost breeding success: Techniques can overcome challenges such as subfertility, behavioral incompatibility, or poor reproductive timing.
Support sustainable zoo populations: By improving breeding outcomes and slowing genetic loss, ART helps zoos build healthy populations of cats.
Provides a “hedge against extinction”: Cryopreserved samples stored in Genome Resource Banks safeguard irreplaceable genetics, ensuring they remain available for future reintroduction efforts.