Within sixty days after the Secretary has given public notice that a stockyard is within the definition of section 202 of this title, by posting copies of such notice in the stockyard, the stockyard owner and every market agency at such stockyard shall file with the Secretary, and print and keep open to public inspection at the stockyard, schedules showing all rates and charges for the stockyard services furnished by such person at such stockyard. If a market agency commences business at the stockyard after the expiration of such sixty days such schedules must be filed before any stockyard services are furnished.