(H) Confined animals shall include, but not be limited to, all cattle, horses, sheep, swine, rabbits, poultry, dogs, cats, fur-bearing animals, and other animals that are held, confined or fed supplementally in enclosures where the excrement accumulates as manure. The numbers of animals per unit of enclosed area shall be a part of this definition when excessive vectors, odor, dust or feathers are produced as determined by the Enforcement Agency or the Department taking into consideration varying regional environmental conditions.