Category — CREW
The loss of our female Sumatran rhino “Suci” to iron storage disease just over a year ago on March 30, 2014 was a devastating blow to the Cincinnati Zoo’s Sumatran rhino breeding program. Iron storage disease is an insidious disease affecting many wildlife species that are maintained in zoos, ranging from marine mammals to birds. In addition to Sumatran rhinos, black rhinos are susceptible to the disease, whereas white rhinos and Indian rhinos remain largely unaffected.
The disease is extremely challenging because we do not know how to prevent it, diagnose it or treat it. The only known cure for the disease is frequent, large volume phlebotomies (blood collection), but nobody knows how much blood to draw or how often it must be removed to keep a rhino healthy, and it is difficult to perform phlebotomies without anesthesia. The best method for monitoring iron storage disease is to measure serum concentrations of ferritin, a protein involved in iron transport and storage, but ferritin can be species-specific, so an assay for humans or horses may not work accurately in rhinos. Such was the case with our Sumatran rhinos.
However, thanks to a dear family committed to helping rhinos that wanted to make a gift in honor of Suci, CREW has embarked on a new study to develop an assay specific for measuring rhino ferritin. The first step – isolating the rhino ferritin protein – is complete, and our goal is to have a functional assay by this coming summer. Our hope is that the assay will be used to monitor iron storage status in many rhinos throughout North American zoos to ensure the disease is detected before the rhino becomes sick.
This project was made possible by the generous donation of Mr. and Mrs. Jeremy S. Hilton and Family.
(Reprinted from CREW Review Fall 2014)
April 3, 2015 4 Comments
Today, let’s celebrate International Polar Bear Day with some fun facts illustrated by some of our own bears, past and present.
Polar bears are survival specialists in an extreme environment—the Arctic, where winter lasts six months and temperatures average -30ºF. Their large body size, thick fur coat and several-inch layer of blubber provide insulation from the cold, in and out of the water.
Here we can certainly get an idea of just how big a polar bear can be. Reaching weights up to 1,500 lbs, a large male can reach heights of more than 10 feet when standing up on its hind legs.
Check out those paws! Each one is the size of a dinner plate! They act like snowshoes, spreading out the bear’s weight as it walks across the snow and ice.
Polar bears have super sniffers. The polar bear can sniff out seals, their favorite prey, from miles away and even detect seals that are hiding underneath several feet of snow.
Their streamlined shape, partially webbed front paws and buoyant layer of blubber make polar bears champion swimmers. In the wild, bears are able to swim for hundreds of miles at a time between ice floes, from which they hunt seals. As our global climate warms, the sea ice continues to shrink, making it increasingly difficult for polar bears to hunt seals and reproduce.
The Zoo partners with Polar Bears International as an Arctic Ambassador Center to help save polar bears and their habitat by reducing carbon emissions to curb climate change and encouraging our supporters to do the same. Here at the Zoo we are doing our part to use energy more efficiently by generating renewable energy through solar panels and geothermal wells and employing green building practices.
We also have a brand new Red Bike Station located at the Zoo’s entrance. Next time you come to the Zoo, consider riding a bike to save on fossil fuels (once all this snow and ice is gone, of course). Check out some other ways you can take action for polar bears suggested by Polar Bears International.
Learn how the Zoo’s Center for Research of Endangered Wildlife (CREW) is also working to save polar bears with science.
February 27, 2015 2 Comments
In September, the Zoo’s Center for Conservation and Research (CREW) was awarded a National Leadership Grant from the Institution of Museum and Library Services in support of a Rhino Assisted Reproduction Enterprise (RARE) initiative for Indian rhinos and African white rhinos. Dr. Monica Stoops will be the Project Director for the grant work and will be working in partnership with Dr. Justine O’Brien from the SeaWorld & Busch Gardens Reproductive Research Center (SWBGRRC), which includes a state-of-the-art sperm sorting and cryopreservation laboratory. CREW will undertake the project to expand access and build capacity for African and Asian rhino reproductive care within North American zoological facilities. Eight zoos have committed to building a Rhino Assisted Reproduction Enterprise (RARE) in collaboration with CREW. This project will help 1) contribute to the genetic management and propagation of captive Indian rhinos through artificial insemination (AI); 2) enhance southern white rhino fertility through exogenous hormone administration prior to natural breeding or AI; 3) build upon national rhino gamete rescue centers at CREW and SWBGRRC; and 4) provide collaborating facilities with individualized training and/or support in rhino assisted reproductive technology (exogenous hormone protocols, ultrasonography, endocrine analysis, AI, and sperm collection, sorting and cryopreservation).
One part of the proposed research will be to continue and expand upon a preliminary CREW investigation conducted to develop an exogenous hormone protocol to initiate reproductive activity in previously acyclic southern white rhinos. The African white rhino remains the most popular rhino species held in U.S. zoos (although we do not currently house them here in Cincinnati). Although captive breeding has been successful and a sufficient number of calves are being produced to consistently maintain the population, the proportion of breeding recommendations resulting in offspring is quite low. It is estimated that <30% of all wild born and <20% of captive born African white rhinos have reproduced in captivity. These numbers reflect a major impediment to achieving a sustainable captive breeding program for this species.
A primary reason for the low reproductive rate is that a vast majority of females display long periods of acyclicity. Significant progress has been made in initiating reproductive activity in acyclic white rhinos in Europe using exogenous hormones. However, many drugs used overseas are not commercially available in the United States. Therefore, it became necessary
to develop novel hormone protocols using U.S. drugs to similarly promote a resumption in reproductive activity for acyclic white rhinos.
CREW scientists, in partnership with several North American zoos, embarked on a preliminary exogenous hormone trial in which four acyclic female white rhinos were treated. Females responded by growing preovulatory follicles, but did not stand for breeding by a male and required an additional hormone to ovulate. This initial hormone protocol may be adequate should artificial insemination be performed, but CREW scientists and partner zoos are working to develop an alternative hormone protocol that will result in natural mating so that more individual rhinos and institutions will benefit. By enhancing the fertility of captive African white rhinos, CREW is helping to ensure the sustainability of this rhino population.
January 14, 2015 1 Comment