Jack,

$30 — That’s the cost to vaccinate a single mare with a Porcine Zona Pellucida (PZP) vaccine.

PZP is a safe, reversible fertility control vaccine used to manage wild horse populations humanely. It’s given to female horses in the wild through remote darting. The vaccine works by preventing fertilization without disrupting the horse’s natural hormones or behavior.

AWHC is proud to run the world’s largest humane fertility control program for wild horses on Nevada’s Virginia Range.

In fact, the Virginia Range program has been so successful that it was the basis for a peer-reviewed scientific paper, published in the journal Vaccines, that affirmed the feasibility of fertility control programs in large wild horse populations who live on expansive habitats.

Jack, through humane fertility control, we’re proving that there is a better way to manage wild horse populations that doesn’t rely on cruel and costly helicopter roundups, which strips thousands of these innocent animals of their freedom — and this year we worked to build upon the success of our Virginia Range program by expanding fertility control to other herds across the West, such as the Cedar Mountain wild horses in Utah!

So today, on the 30th, will you donate $30 or more to AWHC’s Science and Conservation Fund to continue the success of our PZP program in 2025 and beyond?

And don’t forget → Thanks to some of our generous donors, every gift made now through tomorrow at midnight will be 2X MATCHED. That means your $30 gift today helps not 1, but TWO HORSES!

Thank you for your support in the fight to protect America’s wild herds, Jack.

AWHC Field Team