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Hudson, the Polar Bear, Gets a Routine Medical Checkup and a CT Scan at Brookfield Zoo

Thu April 25 2019 1:22 pm  https://www.arlingtoncardinal.com/?p=576416
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Brookfield, Ill. – This week Chicago Zoological Society’s (CZS) veterinary and animal care staff were able to accomplish significant objectives during a routine medical check-up on Hudson, Brookfield Zoo’s 12-year-old male polar bear. The team was able to acquire images of the massive animal on its CT scanner and collect semen that is being used for assisted reproductive techniques with two female polar bears.

All the animals at Brookfield Zoo receive preventative care examinations on a routine schedule to ensure their health. These exams often include CT scans and other diagnostic medical imaging to assess internal organs and other structures. Until recently, animals weighing up 660 pounds or less were able to fit on the CT scan’s table, but an animal like Hudson, who weighs over 1,000 pounds, was simply too heavy. But, that all changed at the end of last year when the zoo was able to purchase a new table with grant funding from the Aurelio M. Caccomo Family Foundation and the Judith and Alan Fleisch Endowment Fund. This new table can accommodate animals up to about 2,200 pounds and interfaces with the zoo’s existing CT scanner, which was donated in 2016 by AMITA Health.

“Being able to get baseline CT images on a polar bear is a significant accomplishment to advance the medical well-being for the species under managed care,” said Dr. Michael Adkesson, vice president of clinical medicine for CZS, which manages Brookfield Zoo. “It allows us to assess Hudson’s joints, internal organs, and overall health. The images provide us with a reference to monitor his health over time and can also be used to compare to other polar bears in the future if needed.”

Polar Bear CT Scan for Hudson at Brookfield Zoo

Polar Bear CT Scan for Hudson at Brookfield Zoo (SOURCE: Brookfield Zoo).

Chicago Zoological Society veterinary staff position Hudson, Brookfield Zoo’s 12-year-old male polar bear, in preparation for a CT scan [above]. The zoo acquired a new table that interfaces with its CT scanner and can accommodates animals up to 2,200 pounds, including Hudson, who weighs just over 1,000 pounds.

The team providing care for Hudson yesterday also included a reproductive physiologist from Cincinnati Zoo’s Linder Center for Conservation and Research of Endangered Wildlife who collected semen from Hudson. Assisted reproductive techniques are still being developed in polar bears, but hold great promise for the overall population of this species in zoos. Polar bears breed seasonally and only produce one to two cubs per year, so there is a lot of interest in developing assisted reproductive techniques to aid the rate of successful breeding. The process of transporting semen is a lot easier than transferring bears between facilities and can also increase the chances of a female becoming pregnant. “The development of assisted reproductive techniques have aided the recovery of many endangered species,” said Dr. Adkesson. “These techniques have worked well in developing sustainable populations of other endangered bears like the giant panda; we hope to someday see similar success with polar bears.”

After confirming the viability of the collected sample, Cincinnati Zoo staff transported the semen to Henry Vilas Zoo in Madison, Wisconsin, to use with one of their polar bears. This week CZS veterinary staff also inseminated Nan, Brookfield Zoo’s female polar bear. The remaining collected semen will be frozen for use in the future.

With the future of the wild polar bear population being more and more threatened by climate change and the loss of arctic sea ice, it is crucial to do everything possible to ensure the survival of the species so that future generations are able to experience seeing these iconic North American mammals. Polar bears are currently listed as a vulnerable species on the US Endangered Species Act and conservation actions are considered necessary for their survival, according to the International Union for Conservation of Nature (IUCN).

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Hudson's airway maintained during CT Scan

Hudson’s airway maintained during CT Scan (SOURCE: Brookfield Zoo).

Dr. Marina Ivančić, veterinary radiologist for the Chicago Zoological Society, takes an ultrasound of Hudson, Brookfield Zoo’s 12-year-old male polar bear, during a physical examination.

Dr. Marina Ivančić, veterinary radiologist for the Chicago Zoological Society, takes an ultrasound of Hudson, Brookfield Zoo’s 12-year-old male polar bear, during a physical examination (SOURCE: Brookfield Zoo).

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