Feed and bedding should be:

The selection of the option concerning feed and bedding being protected from vermin and toxic substances underscores an important aspect of animal care and research protocols. Ensuring that feed and bedding are safeguarded from pests is crucial for multiple reasons, including maintaining the health and well-being of the animals and the integrity of research results. Contaminated feed or nesting materials can lead to various health issues for the animals, which can subsequently affect experimental outcomes and data interpretation.

Protecting these materials from toxic substances is equally essential, as any exposure could lead to adverse effects on the animals and skew the research findings. Proper storage practices minimize the risk of contamination and ensure that the feed and bedding remain safe and suitable for animal use, aligning with ethical standards and regulatory requirements in research animal care.

Other considerations, while relevant, do not adhere to best practices. For instance, storing feed and bedding in areas that may not maintain proper environmental controls or are accessed frequently can increase the risk of contamination or spoilage. Moreover, keeping them near potentially harmful substances, such as detergents and disinfectants, poses a direct risk to animal welfare by increasing the chances of accidental exposure to toxins.