N.J. Stat. § 4:5-53.4
All cattle exceeding two hundred pounds in weight except those to be sold for dairy purposes delivered to any regularly established auction market shall be plainly and permanently marked with the letter "S" in a conspicuous place by the operators or representatives of the auction market. Such marking shall not be construed as cruelty to animals within the meaning of any law of this State.
Cattle delivered to any regularly established auction market to be sold for dairy purposes need not be branded, but if they were consigned to the auction market from a point within this State they shall have been officially tested within sixty days before the sale or shall be tuberculin tested before leaving the sale, the tuberculin test chart to accompany the animal. Cattle consigned to the auction market from any point outside this State shall have met all regulations concerning the importation of cattle into New Jersey as provided in this article.
N.J.S. § 4:5-53.4