Birth control for wild horses could prevent roundups to thin herd
FARGO - An experiment involving birth control for the wild horses in Theodore Roosevelt National Park in western North Dakota is about to get a boost.
Researchers have been testing a vaccine on some of the mares in the wild horse herd in the park's South Unit since 2009.
The immuno-contraceptive vaccine is intended to keep treated mares from ovulating, therefore helping to control the population of the herd.
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