In this section, “sell-by period” means the length of time a Grade A milk product may be kept for sale. After a public hearing, the Secretary shall adopt rules and regulations that establish a method for conspicuously marking, on the Grade A milk product container, the last date on which the product may be sold. Each Grade A milk product container shall be marked as required by rules and regulations adopted under this subtitle. The Secretary shall adopt regulations that establish the sell-by period for a Grade A milk product that is cooled to, packaged, and stored at 45 degrees Fahrenheit or less before it is purchased by or delivered to the ultimate consumer.