The Legislature hereby declares that this chapter is intended to formulate a comprehensive scheme for the regulation of marketing milk. If, however, any provision of, or addition or amendment to, this chapter, either as originally enacted in 1935 at the 51st Regular Session of the California Legislature, or as amended, added to, recodified, or reenacted at any subsequent session of the California Legislature, should be held to be unconstitutional, the unconstitutionality of such provision does not affect any other provision of this chapter.