December 7, 2021

I Tried to Impregnate an Ocelot With Frozen Sperm From a Useless Cat

5 min read


The feminine ocelot lay anesthetized on the examination desk, behind the scenes on the Albuquerque Biopark Zoo. As a veterinarian on the crew getting ready to artificially inseminate this animal, my palms have been sweating on the considered lacking a step, dropping the sperm pattern, or discovering out our pattern didn’t survive freezing. Any of those potentialities would finish the process.

It was the primary time anybody was attempting to provide a being pregnant in a zoo-born feminine ocelot utilizing sperm recovered from a deceased wild male ocelot. If the July 2021 operation labored, it might give his genes a method to reside on previous his loss of life. This process was an vital step in efforts to preserve endangered cat species to allow them to persist into the long run.

Ocelots are medium-sized felines weighing round 20 to 30 kilos (9 to 13 kilograms) with smooth noticed coats. Their weight loss program consists of small mammals, rodents, amphibians, reptiles and birds. Ocelots are primarily solitary cats, most energetic within the night from nightfall to daybreak.

Whereas individuals handle zoo-housed ocelotsโ€™ copy to take care of genetic range, itโ€™s a distinct story for his or her wild kinfolk. There are at the moment solely 50 to 80 ocelots (Leopardus pardalis) identified to exist within the wild within the U.S., and that inhabitants is just too small to be sustainable long run. These endangered animals face ongoing threats of habitat loss and fragmentation, and car strikes. And due to their diminished numbers, they’re susceptible to inbreeding.

An 11-day-old ocelot is fed by a veterinarian in an incubator at La Aurora zoo, in Guatemala Metropolis.

Johan Ordonez/AFP by way of Getty

Over the previous 25 years, scientists on the Center for Conservation and Research of Endangered Wildlife, or CREW, led by veterinarian Invoice Swanson, have been engaged on applied sciences that will ultimately assist add some extra genetic range to the wild ocelot inhabitants. Theyโ€™ve developed and refined strategies for sperm assortment, frozen storage and synthetic insemination of ocelots and different endangered cat species.

These improvements have performed a key position in sustaining the genetic range of cat populations inside zoos. Now, weโ€™re attempting to go a step additional and apply these strategies in wild ocelots.

By creating gene circulate amongst zoo-based ocelots and wild ocelots in numerous areas, we are able to enhance the genetic range of each populations. With wild ocelots, we hope to fight their declining capability to provide offspring, struggle an infection and preserve ample numbers within the wild for conservation of the species within the U.S.

Salvaging sperm to extend range

As a recently graduated veterinarian, I joined my mentor, Debra Miller, on the College of Tennesseeโ€™s Comparative and Experimental Drugs Division and in her work at UTโ€™s Heart for Wildlife Well being. From there, my pursuits in wildlife conservation led me to this multi-institutional collaboration specializing in the conservation of untamed Texas ocelots.

This mission depends on the routine assortment and freezing of semen from wild ocelots within the disciplineโ€”often residing animals, however generally ones which have been discovered useless. Our semen stockpile lets us protect genetic materials even when these cats are killed by illness, pure disasters or highway collisions.

For the substitute insemination process this previous summer season, the sperm donor was a Texas ocelot that died after being hit by a automobile. Whereas this maleโ€™s loss of life was a tragedy, there’s a likelihood his genes could reside on in future offspring because of the short report of his loss of life and the retrieval, transport and processing of his gonads.

A 2-month-old ocelot cub within the Siberian metropolis of Krasnoyarsk.

Ilya Naymushin/Reuters

Again at CREW in Cincinnati, Invoice Swanson labored to recuperate the catโ€™s sperm for future synthetic insemination procedures. He froze 20 plastic straws, every containing about 8 million viable sperm. Along with this deceased male, I’ve collected and cryopreserved semen from a number of residing wild males for future use.

By testing thawed semen, our crew has discovered that many of those sperm samples have been able to fertilizing cat eggs in vitro. The following step is determining whether or not the frozen wild ocelot semen actually can produce kittens by way of synthetic insemination. So Swanson packed up three frozen straws to ship to Albuquerque in a liquid nitrogen dry shipper tank to verify they continue to be at -320 F (-196 C) all through the journey.

After the thaw, hoping for kittens

Ocelots are induced ovulators, that means a feminine should mate with a view to launch an egg into her reproductive tract. The feminine we have been working with was handled with hormones to assist her ovulate on the correct time relative to the insemination process. The reduction was overwhelming once we confirmed, by laparoscopically trying on the floor of the ovary, that the feminine had ovulated a number of eggs.

After thawing the semen straws, my pleasure started to extend as a result of we might see the deceased ocelotโ€™s sperm swimming quickly throughout a slide underneath the microscope. The sperm had survived the freezing and thawing course of and was nonetheless in nice form.

I took a number of deep breaths to regular my fingers as my smile unfold from ear to ear. Invoice Swanson positioned the insemination needle inside every oviduct, I injected the sperm into either side of the feminineโ€™s reproductive tract, and the process was full.

Sadly, though the feminine responded properly to the ovulation synchronization protocol, and the substitute insemination process was carried out with out a hitch, she didn’t conceive. Thatโ€™s not an unusual final result when utilizing frozen semen.

Nonetheless, we’re optimistic that future proceduresโ€”utilizing semen samples from this particular male and different frozen samples from residing, wild ocelotsโ€”will efficiently produce pregnancies. By the top of 2021, we plan to conduct two further synthetic insemination procedures with zoo-managed ocelots, adopted by three or 4 extra in 2022.

If any of those synthetic insemination procedures consequence within the delivery of offspring, it will likely be the primary time kittens have been produced with frozen semen from a wild ocelot. Theyโ€™ll add larger range to the ocelot inhabitants managed in North American zoos, whereas bettering our understanding of potentialities for rising genetic range inside wild ocelot populations. This success would assist reveal the feasibility of manufacturing kittens utilizing frozen semen from the endangered Texas ocelot inhabitants.

Additional refinement of the data and strategies to create genetic trade between wild and zoo-managed ocelot populations or amongst wild ocelot populations residing in fragmented habitats will assist make sure that these animals survive into the long run.

Ashley Reeves is a PhD candidate in comparative and experimental drugs on the College of Tennessee

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