Each packer, swine contractor, live poultry dealer, stockyard owner, market agency, and dealer, upon proper request, shall give to the Secretary or his duly authorized representatives in writing or otherwise, and under oath or affirmation if requested by such representatives, any information concerning the business of the packer, swine contractor, live poultry dealer, stockyard owner, market agency, or dealer which may be required in order to carry out the provisions of the Act and regulations in this part within such reasonable time as may be specified in the request for such information.