7 USC 2219a - Overtime and holiday pay

(a) In general 
The Secretary of Agriculture may
(1) pay employees of the Department of Agriculture employed in an establishment subject to the Federal Meat Inspection Act (21 U.S.C. 601 et seq.) or the Poultry Products Inspection Act (21 U.S.C. 451 et seq.) for all overtime and holiday work performed at the establishment at rates determined by the Secretary, subject to applicable law relating to minimum wages and maximum hours; and
(2) accept from the establishment reimbursement for any sums paid by the Secretary for the overtime and holiday work, at rates determined under paragraph (1).
(b) Availability 
Sums received by the Secretary under this section shall remain available until expended without further appropriation and without fiscal year limitation, to carry out subsection (a) of this section.