The incident began in late November with a phone call from a Douglas County resident and now 21 of the horses are in captivity at Palomino Valley.
The studs have been gelded and separated from the mares.
They will be auctioned next month, according to a report by KOLO News of Reno.
The horses lived in the Pine Nut Mountains Herd Area, south of the HMA, which was gathered earlier this year.
The local ‘advocacy’ group took a pro-ranching message to the WHBAB in October.
Western Horse Watchers Association 