Under the Proposed Action, the BLM would conduct gathers, approximately two to four times over a six to ten year period; to remove excess wild horses until the Bible Springs Complex wild horse population is at the lower AML. If the lower AML were reached before the end of the 10 year period, additional gathers would be conducted to maintain the wild horse population in the Bible Spring Complex to within the AML. Fertility control would be used in the Bible Spring, Four Mile, and Tilly Creek HMAs to reduce the annual population growth. The primary use of fertility control would be to maintain the population within AML once achieved. It could be used previous to achieving AML if gather success, holding capacity limitations, population growth rates, other national gather priorities or other circumstances prevent achieving AML during a gather.