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EPIDEMICS
Scientists, feds aim to curb spread of brucellosis in Yellowstone
by Brooks Hays
Bozeman, Mont. (UPI) Jul 3, 2015


Young mice exposed to feline urine less likely to escape cats
Prague, Czech Republic (UPI) Jul 3, 2015 - Young mice exposed to cat urine are less likely to escape feline hunters later in life.

When the smell of cat urine is normalized at a young age, mice are less likely to avoid the same smells later in life, and thus more likely to meet their demise in the grasp of feline claws.

"Because the young mice (less than two weeks old) are being fed milk while being exposed to the odour, they experience positive reinforcement," Dr. Vera Voznessenskaya, a researcher at Russia's A. N. Severtsov Institute of Ecology and Evolution, said in a press release. "So they don't escape the cats when exposed to cat odour later on."

Researchers were able to identify the molecule in cat urine that affects the behavior. Previous research has shown the molecule, called L-Felinine, to influence mice reproduction -- thwarting a female's ability to get pregnant and shrinking litter sizes.

Perhaps most interestingly, researchers found the molecule manipulates the behavior response of mice, while their hormonal response remains the same.

"Early olfactory experience with cat odours produced dissociation in responses to these odours later in the life at the behavioral level and at the hormonal level," researchers explained.

"In fact, mice that had experienced the odour showed stress response (elevated corticosterone) to cat odors in the same way as controls," Voznessenskaya added.

Voznessenskaya and her colleagues presented their findings this week at the Society for Experimental Biology 2015 meeting in Prague.

Brucellosis is a bacterial disease commonly carried by elk and bison in Yellowstone National Park. The disease can sometimes make its way into domestic cattle herds, causing miscarriages and other health problems.

This week, a panel of scientists was convened in Bozeman, Mont., to advise park officials and the U.S. Department of Agriculture on how best to manage wild and domestic herds to prevent the spread of disease. The meeting was called by the USDA's Animal and Plant Health Inspection Service, or APHIS.

Academics from the National Academies of Sciences met with park and agricultural policy makers, in addition to Montana State University officials, on Wednesday and Thursday. The meeting offered state and federal wildlife biologists, as well as livestock representatives, to offer their perspectives on the current situation.

"We want you to ... help us see a future path for actions we might take to address brucellosis in the Greater Yellowstone Area," Ryan Clarke, of APHIS, told the meeting attendees -- as reported by the Billings Gazette.

Fear of the spread of brucellosis has inspired the slaughter of hundreds of bison that wander outside the boundaries of Yellowstone. Yellowstone's herd was reduced by 900 this winter, with most being sent to local Native American tribes for slaughter. Ranchers prefer a more aggressive form of management, while conservationists are apprehensive about large scale culling programs.

A lot of people have strong opinions on how the animals should be managed, but not all of them are equally grounded in science.

"And even though their conception of how wildlife should be controlled and managed may have a foundation on Walt Disney, or on reality, for them it's very real," P. Ryan Clark, a veterinarian with the USDA, told Montana Public Radio.

By bringing in a team of experts, officials hope to lend some informed impartiality to the drafting of a new management plan. Additional meetings will take place in September and November, one of which will take place in Wyoming.

The panel -- which is being asked by APHIS to "lay a scientific foundation for any future actions that could be applied to contain or suppress brucellosis across the region" -- will deliver a final report in the spring of 2016.


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