A new management program for the Pryor Mountain wild horse herd in northern Wyoming would reduce the herd's numbers while developing those horses' Spanish Colonial characteristics, according to news releases.

The Bureau of Land Management is taking public comment on the management plan for the next 30 days. The plan includes reducing the herd from 170 to about 90 to 120 animals through roundups and birth control for breeding age mares. The reduction would keep the range in better condition, according to the BLM.

The Pryor herd has been identified as descendants of New World Spanish breeds and related to European Iberian breeds, according to genetic research complete in 1991. The horses carry a rare gene form variant that has been tracked to the original breeds brought to the Americas in the 1500s.

The management plan has not been fully updated since 1984, according to the blog www.pryorwild.wordpress.com, which posted the management plan and answered questions about its scope. The BLM field office is encouraging questions and comments during the 30-day review period.