21 CFR §507.14

1. (a)The management of the establishment must take reasonable measures and precautions to ensure that all persons working in direct contact with animal food, animal food-contact surfaces, and animal food-packaging materials conform to hygienic practices to the extent necessary to protect against the contamination of animal food.
2. (b)The methods for conforming to hygienic practices and maintaining cleanliness include:
   1. (1)Maintaining adequate personal cleanliness;
   2. (2)Washing hands thoroughly in an adequate hand-washing facility as necessary and appropriate to protect against contamination;
   3. (3)Removing or securing jewelry and other objects that might fall into animal food, equipment, or containers;
   4. (4)Storing clothing or other personal belongings in areas other than where animal food is exposed or where equipment or utensils are cleaned; and
   5. (5)Taking any other necessary precautions to protect against the contamination of animal food, animal food-contact surfaces, or animal food-packaging materials.