Why is a cage-change protocol important in mouse housing?

• A. To standardize feeding times.
• B. To maintain sanitation, reduce pathogen load, and minimize stress by a predictable routine.
• C. To maximize cage changes per day for cleanliness.
• D. To minimize handling of mice during changes.

Answer: (B)

The main idea is that a cage-change protocol creates a consistent, evidence-based routine for cleaning and handling that supports both sanitation and animal welfare. Regular cage changes remove waste, urine, spoiled bedding, and food residues, which lowers pathogen and ammonia buildup and reduces the chance of disease spreading among cage mates. A predictable schedule helps the mice anticipate routine, reducing stress compared with irregular or surprise changes. A well-designed protocol also standardizes how changes are performed—using clean equipment, fresh bedding, proper protective gear, and gentle handling—to minimize cross-contamination and allow health issues to be noticed promptly. While some aspects of care touch on feeding or handling, the strongest reason this protocol is important is its combination of sanitation and stress-reducing, routine-based management.