May in accordance with the standard set forth in section 206 of this title determine and prescribe what will be the rate or charge, or rates or charges, to be thereafter in such case observed as the maximum or minimum or both to be charged, and what regulation or practice is or will be just, reasonable, and nondiscriminatory to be thereafter followed: Provided, That the Secretary shall prescribe the rate or charge, or rates or charges, on a percentage or per head basis at the election of the stockyard owner or market agency, or on any other basis elected by the stockyard owner or market agency unless the Secretary finds such other basis to be violative of section 206 of this title; and

May make an order that such owner or operator (1) shall cease and desist from such violation to the extent to which the Secretary finds that it does or will exist; (2) shall not thereafter publish, demand, or collect any rate or charge for the furnishing of stockyard services other than the rate or charge or rates or charges so prescribed; and (3) shall conform to and observe the regulation or practice so prescribed.