Author Archives: webuser

Taking back the West — one contraceptive dart at a time

Phil Taylor, E&E reporter Published: Monday, July 29, 2013 GRAND JUNCTION, Colo. — Josie, a buckskinned mare that roams the Book Cliffs here, had given birth every year from 1996 to 2003. First, there was Joker. And then came Classy, … Continue reading

Birth control effort aims to maintain McCullough herd

Written by Gib Mathers A McCullough Peaks mustang mare named Dazzle may have dodged the dart Thursday, but very soon she will be inoculated to preempt pregnancy for another year.  The horse will remain healthier to boot, thanks to the … Continue reading

Local nonprofit gets $100k for wild horse fertility control

. . It’s been a good couple of months for the Science and Conservation Center, a Billings-based nonprofit that develops wildlife contraceptives. The center produces porcine zona pellucida (PZP), which is the active ingredient in a contraceptive vaccine. In February, … Continue reading


The Environmental Protection Agency (EPA) announced the registration of a contraceptive vaccine for horses.  The vaccine, porcine zona pellucida (PZP) has been registered under  the name ZonaStat-H and is the first contraceptive vaccine approved for use in equids. The active … Continue reading