SCIENTISTS TRYING BIRTH CONTROL TO REIN HORSE HERDS WILD MARES GET SHOTS OF SUBSTANCE MADE FROM PIG MEMBRANE.(News/National/International) From: Rocky Mountain News (Denver, CO) | Date: March 31, 1996 | COPYRIGHT 1996 Rocky Mountain News. All rights reserved. Reproduced with the permission of the Dialog Corporation by Gale Group. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information) Copyright information

Byline: Doug McInnis The New York Times

Even in an age of endangered species, many animals are so prolific that they're straining their environments and clashing with their human neighbors. One solution, being tested on wild horses in the West, is birth control.

In January, the Bureau of Land Management rounded up 267 mares in the Nevada desert and vaccinated them with porcine zona pellucida, or PZP, a long-lasting contraceptive made from the membrane that surrounds the ovum of the pig.

The same vaccine is being tested on deer in New York, Ohio and Maryland, and on ...

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