Does PZP result in wild herds with lower immune systems and potential for die-offs? PZP is an immunocontraceptive which causes an immune reaction to reject fertilization, while the females still come into estrus. Besides wrecking havoc on the immune system, injecting herds with PZP results in more fighting between males and many other behavior abnormalities. Tule elk in Pt. Ryes National Seashore (Marin County, California) were part of a PZP, Porcine Zona Pellucida, experiment. Several years later there was a strange die-off. Read more here: http://protectmustangs.org/?p=8679 BLM is rounding up wild horses to give them PZP, made from slaughterhouse pig ovaries for birth control. Many never make it back to the wild. They end up fattened up in holding pens or long-term holding and ultimately after several years and/or strikes they become at risk of going to slaughter. That's the truth. The safest place for wild horses is out on the public sanctuaries known as herd management areas. Despite the spin in movies like UNBRANDED, wild horses and burros are underpopulated in America today. The federal agency in change of managing our national treasures in the West, is managing them to extinction. PZP = slow extinction. It's time to unite for wild horses and burros' right to live as the law proclaims--in true freedom!! With dedication, Anne Anne Novak Founder & Volunteer Executive Director www.ProtectMustangs.org Mission: To protect and preserve native and wild horses PROTECT MUSTANGS PO Box 5661 Berkeley, CA. 94705