The cost of administering this chapter, including the cost of inspection, must be paid from appropriations made for this purpose, except to the extent of federal contributions as provided in section 31A.21. The commissioner may pay employees of the Department of Agriculture employed in establishments subject to this chapter for overtime work performed at the establishments. The commissioner may accept from the establishments where the overtime work is performed reimbursement for sums paid by the commissioner for overtime work. Reimbursements must be deposited in the treasury and credited to the accounts from which the overtime costs were paid.