Final answer:
The one preventive control that is not part of the FSMA animal food rule is allergen.
Step-by-step explanation:
The one preventive control that is not part of the FSMA animal food rule is Allergen. The FSMA animal food rule, which stands for Food Safety Modernization Act, is a set of regulations that aim to improve the safety of animal food. These regulations cover various aspects including supply chain, process, and sanitation. However, allergen control is not specifically mentioned as a preventive control in the animal food rule.