ARES OptiMice Loft Mouse Cage Enrichment
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The Optimice Loft mouse cage enrichment (Part No. C43261) is a multipurpose vivarium enrichment accessory designed to expand usable cage space and support the psychological well-being of laboratory mice housed in individually ventilated cage (IVC) systems. Compatible with all OptiMice caging and most auto-watering cage systems, the loft fits snugly into the front-left corner of the cage and is secured by the cage top, adding 19 square inches (122 sq cm) of floor area to bring total usable cage floor space to 94 square inches — without interfering with feeders, internal water bottles, or Blockparty cage bottom assemblies.
Designed to meet Animal Care Systems Optimice, Ergomice, and SMART System cage standards, the Optimice Loft gives mice the ability to segregate cage space for nesting, play, social avoidance, and refuge-seeking — behavioral needs recognized by the Guide for the Care and Use of Laboratory Animals and relevant to IACUC environmental enrichment programs and AAALAC accreditation compliance. The loft also serves a critical welfare function in male mouse colonies: it provides an elevated refuge that allows subordinate or targeted animals to escape an alpha male, reducing injury risk from aggression and bullying without requiring cage separation.
Multiple entry and exit ports on both the upper platform and the sheltered space beneath allow uninhibited movement and quick access during cage change procedures. The loft is molded from high-temperature polysulfone autoclavable to 285°F (140.5°C), compatible with standard vivarium sterilization workflows and the full Optimice cage component line. ARES Scientific is an authorized distributor for Animal Care Systems, ensuring genuine products with full manufacturer warranty.
Description
Optimice Loft (C43261) – Product Highlights
- Expands cage floor area to 94 total square inches by adding 19 sq in (122 sq cm) of usable space, giving mice a multi-level environment that supports natural exploration and space partitioning within standard IVC cages.
- Reduces stress through cage compartmentalization — mice naturally organize their environment into distinct zones for nesting, playing, elimination, and social interaction, resulting in healthier behavioral profiles and improved research subject welfare.
- Provides a critical refuge for male mice in group-housed colonies, allowing targeted or subordinate animals to escape an alpha male and avoid injuries caused by aggression and bullying without requiring physical cage separation.
- Compact, partly enclosed lower space beneath the loft platform creates an instinctively preferred nesting area, reducing stress-related behaviors in socially housed rodent colonies.
- Multiple entry and exit ports on both levels enable uninhibited movement, support social housing dynamics, and allow mice to avoid cage-mates — reducing aggression in group-housed colonies.
- Compatible with all OptiMice caging and most auto-watering cage systems, as well as Blockparty cage bottoms, all scruffing-grid feeders, and internal water bottles — integrating into existing IVC rack configurations without modification.
- High-temperature polysulfone construction withstands autoclave sterilization to 285°F (140.5°C), integrating seamlessly into standard vivarium cage change and decontamination workflows.
- Tool-free installation secured by the cage top in the front-left corner — installs and removes in seconds during routine cage changes with no impact on existing cage configurations.
- Supports environmental enrichment compliance with IACUC program requirements and the Guide for the Care and Use of Laboratory Animals, providing structured refuge, nesting, and behavioral complexity within the cage.
- ARES Scientific is an authorized distributor for Animal Care Systems, ensuring genuine Optimice Loft units with full manufacturer warranty and application support.
Frequently Asked Questions – ARES OptiMice Loft (C43261)
What is the ARES OptiMice Loft and what does it do?
The ARES OptiMice Loft (C43261) is a mouse cage enrichment device manufactured by Animal Care Systems that fits into the front-left corner of compatible IVC cages and expands usable floor area by 19 square inches (122 sq cm), bringing total cage floor space to 94 square inches. It provides a two-level environment with a sheltered lower space for nesting and an upper platform for exploration, supporting natural mouse behaviors including space segregation, refuge-seeking, and social avoidance within group-housed colonies.
Is the ARES OptiMice Loft compatible with IACUC environmental enrichment requirements?
The OptiMice Loft is designed to support environmental enrichment programs consistent with the Guide for the Care and Use of Laboratory Animals and IACUC-mandated enrichment protocols by providing structural complexity, nesting opportunities, and refuge access within the cage. Facilities pursuing or maintaining AAALAC accreditation can incorporate the OptiMice Loft as a documented enrichment strategy within their animal care program. Consult your IACUC for program-specific compliance determinations.
What IVC cage systems is the OptiMice Loft compatible with?
The OptiMice Loft is compatible with all OptiMice caging and most auto-watering cage systems, as well as Animal Care Systems Ergomice and SMART System IVC cage lines and Blockparty cage bottom assemblies. It works with all scruffing-grid feeders and internal water bottles, requiring no modification to existing IVC rack systems.
Can the OptiMice Loft be autoclaved?
Yes — the OptiMice Loft is manufactured from high-temperature polysulfone and is autoclavable to 285°F (140.5°C), making it compatible with standard gravity and pre-vacuum autoclave cycles used in vivarium cage wash and decontamination workflows. It can be processed alongside standard cage components without requiring a separate sterilization protocol.
How does the OptiMice Loft reduce stress and aggression in laboratory mice?
The loft provides structural complexity that allows mice to partition cage space behaviorally — establishing distinct zones for nesting, elimination, social interaction, and refuge-seeking. In male mouse colonies, the elevated loft platform serves as a critical escape refuge, allowing subordinate animals to avoid an alpha male and reduce injury risk from bullying and aggression without requiring physical cage separation. The compact, partly enclosed lower space is particularly effective as a nesting site, further reducing chronic stress indicators in group-housed colonies.
Does the OptiMice Loft require any tools or cage modification to install?
No tools or cage modifications are required — the OptiMice Loft sits in the front-left corner of the cage and is held in place by the cage top when the lid is secured. Installation and removal are performed in seconds during standard cage change procedures, with no impact on existing feeder, water bottle, or auto-water configurations.
Technical Specifications – Animal Care Systems Optimice Loft
| Part Number: | C43261 |
| Product Type: | Mouse Cage Enrichment Loft |
| Material: | High-Temperature Polysulfone |
| Standard Color: | Red |
| Autoclave Temperature (Max): | 285°F (140.5°C) |
| Floor Area Added: | 19 sq in (122 sq cm) |
| Total Cage Floor Area (with Loft): | 94 sq in |
| Cage Placement: | Front left corner; secured by cage top |
| Compatible Cage Systems: | All OptiMice caging; Ergomice; SMART System IVC cages; Blockparty cage bottoms |
| Auto-Watering Compatibility: | Compatible with most auto-watering cage systems |
| Feeder Compatibility: | All feeders including scruffing-grid feeders |
| Watering Compatibility: | Internal water bottles; auto-water cages |
| Entry/Exit Ports: | Multiple (upper platform and lower enclosed space) |
| Manufacturer: | Animal Care Systems (ACS) |


