N.H. Rev. Stat. Ann. § 436:6

The commissioner is authorized to accept, on behalf of the state, the rules and regulations prepared by the Secretary of Agriculture under and in pursuance of section 3 of an act of Congress approved May 29, 1884, entitled "An act for the establishment of a bureau of animal industry to prevent the exportation of diseased cattle, and to provide means for the suppression and extirpation of pleuropneumonia and other contagious diseases among domestic animals," or of any other such act of Congress, and he may cooperate with the authorities of the United States government within this state in the carrying out of such rules and regulations and the enforcement of the provisions of any such act or acts so passed which are not in conflict with the statutes of this state.