There are authorized to be appropriated such funds as may be necessary to carry out the purposes of this chapter, to remain available until expended.

Of the amounts made available under subsection (a) for a fiscal year, 25 percent shall be set aside until April 1 of that fiscal year for the repair or replacement of fencing.

In implementing this chapter, the Secretary may use the facilities, services, and authorities of the Commodity Credit Corporation.

The Commodity Credit Corporation shall not make any expenditures to carry out the provisions of this chapter unless funds specifically appropriated for such purpose have been transferred to it.