43 C.F.R. § 4710.4 : Public Lands: Interior — REGULATIONS RELATING TO PUBLIC LANDS — BUREAU OF LAND MANAGEMENT, DEPARTMENT OF THE INTERIOR — RANGE MANAGEMENT (4000) — PROTECTION, MANAGEMENT, AND CONTROL OF WILD FREE-ROAMING HORSES AND BURROS — MANAGEMENT CONSIDERATIONS — Constraints on management

Management of wild horses and burros shall be undertaken with the objective of limiting the animals' distribution to herd areas. Management shall be at the minimum level necessary to attain the objectives identified in approved land use plans and herd management area plans.

43 C.F.R. § 4710.4