The keeping of fowl and livestock is allowed in single-family residential areas provided the following minimum requirements are met:

A. The lot or tract of land is at least one acre in size.

B. The number of animals shall be limited to one hundred animal units (A.U.) per acre. Animal unit value shall be as follows:

1. Horse, cow, donkey, etc.-fifty A.U.

2. Sheep, goat, llama, etc.-twenty A.U.

3. Chickens, geese, fowl, etc.-four A.U.

C. Livestock and fowl in residential (CR) zones are allowed only for domestic use or consumption and shall not be raised for commercial purposes. The keeping or raising of pigs or swine in residential areas is not allowed.

D. All animals in residential zones shall be kept inside fenced enclosures. Related buildings such as barns and animal pens shall be allowed only in rear and side yards of the tract or lot. (Ord. 523 § 1(part), 1989)