The Campaign Against America’s Wild Horses, a leader in nonmotorized removal, reported today that 141 mares received 141 doses of PZP during the month, 27 given as primers and 114 as boosters.
Over the life of the program, which began in 2019, the advocates have pumped 9,767 doses of the pesticide into 2,058 mares, for an average of 4.7 doses per mare.
Since the beginning of the year, 154 foals have been born and 44 died.
The current population is thought to be 3,515, with 302 horses listed as missing, compared to 3,548 with 311 horses listed as missing in July.
The population was 3,521 with 302 horses listed as missing in June and 3,502 with 310 horses listed as missing in May.
The loss of 24 wild horses in the Sunny Hills fiasco was not discussed.
The Year 6 agreement with NDA has not been posted to the darting resources page.
The Year 5 summary has not been posted to the monthly reports page.
A goal for September is to maximize booster treatments so the herd will continue to shrink and to complete the training of newly certified darters.
Not discussed in the August update:
- Long-term population goal
- Number of viable mares
- Size of breeding population
- Loss of genetic diversity
- Changes in death rate and sex ratio
- Unlawful use of pesticides
The report will be submitted to the Nevada Department of Agriculture.
RELATED: Virginia Range Darting Update for July 2024.

