The Reveille mares, captured in a roundup earlier this month, are affected.
Up to 27 will be treated with GonaCon Equine, a fertility control pesticide, and be returned to the HMA with 26 stallions.
They have already received a primer. When will they receive the booster?
Appendix E, released last week with the Final EA and DR for pest control actions in the Owyhee HMAs, refers to the 2013 product registration on page 4, which authorized a 30-day interval between treatments.
A 2015 registration amendment maintained the 30-day interval and restricted-use designation.
However, a 2017 amendment that dropped the RUP designation also extended the interval between treatments to 90 days.
Therefore, application of the boosters 30 days after the primers could be construed as misuse of the product, a violation of federal law.
RELATED: Owyhee Decision Published.
Western Horse Watchers Association 