N.J. Stat. Ann. § 54:4-7

The tax collector of each municipality shall annually deduct from the taxes on personal property due from the owners of cattle slaughtered under the provisions of sections 4:5-18 to 4:5-33 of the title Agriculture and Domestic Animals, which shall have been assessed on those cattle at the time other personal property is assessed, the amount of taxes due from the owners on the cattle so assessed and slaughtered. Before the deductions are made, the owners shall present to the collector proof in writing under oath that the cattle have been assessed for taxes in the name of the owner and that they were slaughtered under the provisions of law above referred to.