Light agricultural uses including farms on a commercial scale devoted to the hatching, raising, fattening, or marketing of animals such as, but not limited to, poultry, rabbits, goats, sheep, pigs; aviaries and kennels; the grazing and experimental or selective breeding or training of cattle or horses; provided, that such use is not a part of, nor conducted as, stock feed or livestock sales yards, or a commercial riding academy located on the same premises.