It shall be unlawful, in determining the value of milk, cream, or other dairy products by the use of the Babcock test, to give any false reading or in any way manipulate the test so as to give a higher or lower percent of butterfat than the milk, cream, or other dairy products actually contain, or to cause any inaccuracy in reading the percent of butterfat by securing from any quantity of milk, cream, or other dairy products to be tested an inaccurate sample for the test. The result of a test reported to the producer for the basis of the payment must be the same as the laboratory record of the test, all records to be in indelible pencil or ink and filed for a period of at least sixty (60) days. All samples of milk or cream, tests of which are to be used as a basis of payment, shall be kept in a cool place in tightly stoppered or tightly covered jars for at least twenty-four (24) hours after the test of the samples has been completed. Where Sundays and holidays intervene, samples shall be held for forty-eight (48) hours after completing the tests. Samples of whole milk shall be treated with proper preservatives to ensure accuracy of the test. Samples of milk for testing shall not be gathered over a period of more than sixteen (16) days, and the samples of milk shall be tested immediately after the period of gathering the samples.