The Department, after investigation and public hearing, shall establish standards for grading and classification of shell eggs according to the size or weight, quality factors (interior and exterior) including condition of white and yolk, the size and condition of the air cell and cleanliness and soundness of shell. In establishing these standards, the Department may follow the standards promulgated by the United States Department of Agriculture and may, after investigation and public hearing, amend the Illinois standards from time to time so that the federal specifications can be followed consistently if so desired. Copies of any standards so established, or any amendment thereof, shall be kept on file in the office of the Director.
     The Department shall promulgate a regulation providing that when eggs are purchased on a basis of grade yield, a uniform type of report shall be issued to the producer by the purchaser showing grade yield of eggs that have been purchased from the producer.