Creameries and factories that purchase milk and cream from producers of same on a butterfat basis, and pay for same on their own test, shall make and pay on correct test, and any failure to do so shall constitute a violation of this Article. The Board of Agriculture, under regulations provided for in N.C. Gen. Stat. § 106-253, shall have such test made of milk and cream sold to factories named herein that will show if dishonest tests and practices are used by the purchasers of such products. (1921, c. 169, s. 5; C.S., s. 7251(e).)