When the quantity of milk delivered to a milk dealer by or for the account of a producer is determined by weighing, or otherwise, an accurate record of each such determination showing the quantity of milk received for the account of each such producer shall be made at once. Each such original record containing information with respect to the quantity of milk received for the account of one or more producers, whether the records be for one day or more than one day, shall be dated and signed by the person making the determination, and shall be preserved by the milk dealer purchasing or receiving such milk regardless of the fact that such milk dealer may copy such records for the purpose of making a more permanent record for the milk dealer's own use.