Toward a mouse neuroethology in the laboratory environment

Area of Science:

• Neuroscience
• Animal Behavior
• Ethology

Background:

• Laboratory animal housing conditions can influence experimental outcomes.
• The impact of subtle environmental variations on animal behavior and neurobiology is not fully understood.

Purpose of the Study:

• To investigate the effects of different mouse cage types on aggressive behavior and olfactory bulb neuroanatomy.
• To identify the environmental factors responsible for observed phenotypic changes.

Main Methods:

• Characterization of auditory and temperature environments of two distinct cage types.
• Assessment of aggressive behavior in mice housed in different cages.
• Naris occlusion experiments to determine the role of olfactory input.

Main Results:

• Differences in cage type led to unexpected changes in aggressive behavior and mouse olfactory bulb neuroanatomy.
• Naris occlusion abolished the observed neuroanatomical alterations.
• The olfactory environment was identified as a key factor mediating these phenotypic changes.

Conclusions:

• Subtle changes in the laboratory environment, specifically the olfactory environment, can profoundly affect sensory input and neural output in mice.
• Neuroethological approaches are crucial for understanding how the laboratory environment influences neural systems and behavior beyond basic well-being.