Mares that don’t respond to PZP have weak immune systems, a trait that can be passed on to their offspring.
The pesticide tricks their immune system into attacking their ovaries.
What does the future hold for this little guy?
Maybe his mom fled from another area in fear of the advocates.
The Campaign Against America’s Wild Horses administers the sterilization program, now in its sixth year, presumably, although the new agreement with NDA has not been posted to its darting resources page.
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Western Horse Watchers Association 