Extended Sanitation Intervals for Cage Components and Automated Watering Valves: Validation and Cost Analysis

Area of Science:

• Laboratory Animal Science
• Animal Welfare
• Biomedical Research Infrastructure

Background:

• Standard protocols recommend changing rodent cage components every 2 weeks.
• Extended sanitation intervals may be permissible if the cage microenvironment remains uncompromised.
• Optimizing sanitation schedules is crucial for resource management in research facilities.

Purpose of the Study:

• To evaluate extended sanitation intervals for mouse individually ventilated caging (IVC) components.
• To assess the impact of prolonged sanitation on organic matter load using ATP luminometry.
• To determine potential time and cost savings associated with extended sanitation frequencies.

Main Methods:

• ATP luminometry was used to measure organic matter on cage components (automated watering valves, wire bar lids, filter tops).
• Sanitation intervals were extended to 28, 56, and 84 days, with watering valves tested up to 168 days.
• Time-and-motion studies were conducted to estimate labor and cost savings.

Main Results:

• No significant differences in organic matter load were detected between the 14-day control and extended sanitation intervals for all tested components.
• Extending sanitation to 84 days for 10,000 cages could save approximately 3,000 technician hours and $100,000 annually.
• This study provides the first validation for extended sanitation of automated watering valves in IVCs.

Conclusions:

• Extended sanitation intervals for mouse IVC cage components are feasible without compromising the microenvironment.
• Implementing longer sanitation schedules can lead to substantial labor and cost efficiencies for animal care staff.
• Findings support revising current sanitation guidelines to optimize resource allocation in research settings.