For the purposes of this article, the following animals shall be deemed not to be used substantially for pleasure riding or trail use and shall be exempt from the pleasure riding tax, except that any stock animal so exempted shall be subject to the provisions of Section 53946:
(a)
Any head of stock ridden or used by the owner, his family or his employee primarily in the carrying on of a business or ranch operation;
(b)
Any head of stock used by the owner for rental use entirely upon private lands under the jurisdiction of the owner;
(c)
Any head of stock used by the owner for rental use primarily upon a parcel of land belonging to the federal government if the taxing agency does not use the proceeds of a tax under this article for improvements within that parcel of land; and
(d)
Any other class of animal specifically exempted by the taxing agency.