The Campaign Against America’s Wild Horses, a leader in nonmotorized removal, reported today that 82 mares received 82 doses of PZP during the month, 17 given as a primer and 65 as a booster.
Over the life of the program, which began in 2019, the advocates have pumped 8,609 doses of the pesticide into 1,994 mares.
Two foals were born and one died of unspecified causes.
The current population is thought to be 3,465 with 342 horses listed as missing, compared to 3,471 with 336 listed as missing in December.
Goal for February: “Continue to maximize booster treatments to mares across the Virginia Range before spring breeding season to prevent pregnancies, and continuing to allow for humane population decrease.”

Not discussed in the report:
- Long-term population goal
- Size of breeding population
- Loss of genetic diversity
- Changes in death rate and sex ratio
- Unlawful use of pesticides
PZP tricks the immune system into attacking the ovaries, resulting in sterility after five years of treatment.
The report will be submitted to the Nevada Department of Agriculture.
RELATED: Virginia Range Darting Update for December 2023.
















