Horses may be kept in residential zones provided that:
(a) There shall not be more than one horse per acre of land;
(b) Only mares and/or geldings shall be kept;
(c) The minimum acreage on which horses may be kept shall be 2-1/2 acres;
(d) Such land shall be fenced so as to securely confine said animals;
(e) Any building used in connection with the keeping of horses shall be located at least 50 feet from any property line.
(1969 Code 150.208)