Bedding Material Affects Mechanical Thresholds, Heat Thresholds, and Texture Preference

Area of Science:

• Animal behavior research
• Laboratory animal science
• Neuroscience

Background:

• Cage bedding is known to influence animal breeding and environment.
• Limited data exists on bedding effects on evoked and nonreflexive behaviors.
• Understanding these effects is crucial for accurate behavioral research.

Purpose of the Study:

• To investigate the impact of different bedding types on somatosensory perception in mice.
• To evaluate how bedding affects behavioral responses under normal and inflammatory conditions.
• To determine the optimal bedding for behavioral assays.

Main Methods:

• C57BL/6 mice were housed on five different bedding types for two weeks.
• Mechanical sensitivity, thermal sensitivity, and cold preference assays were performed.
• Tactile conditioned place preference and wheel running assays were utilized.
• Inflammation was induced to assess bedding effects on pain sensitivity dynamics.

Main Results:

• TEK-Fresh bedding significantly increased mechanical and heat withdrawal thresholds compared to aspen.
• Bedding type did not affect responses to light touch but influenced noxious stimuli sensitivity.
• TEK-Fresh and Pure-o'Cel bedding showed a greater dynamic range in inflamed paws.
• Mice showed a preference for TEK-Fresh over aspen bedding in a conditioned place preference assay.

Conclusions:

• Cage bedding material significantly alters somatosensory assay results in mice.
• TEK-Fresh bedding provides the least sensitive baseline thresholds and greatest dynamic range post-injury.
• Careful selection of bedding is essential for reliable behavioral somatosensory research.