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Sorting it out: bedding particle size and nesting material processing method affect nest complexity.

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Area of Science:

  • Animal Welfare Science
  • Laboratory Animal Science
  • Behavioral Science

Background:

  • Nesting material enhances laboratory mouse well-being and performance.
  • Efficient and uniform provision of nesting material to diverse mouse strains is challenging.
  • Understanding nest-building behavior is crucial for optimizing animal husbandry.

Purpose of the Study:

  • To investigate the impact of bedding particle size, delivery method, and processing on mouse nest building.
  • To compare nest-building abilities across mouse strains with differing gathering skills.
  • To optimize nesting material provision for improved laboratory mouse welfare.

Main Methods:

  • Assessed nest building in BALB/cAnNCrl (strong gatherers) and C3H/HeNCrl (weak gatherers) mice.
  • Manipulated bedding particle size and nesting material processing (grinding).
  • Evaluated different methods of nesting material delivery, including mixing with bedding substrate.

Main Results:

  • Processing nesting material with bedding via grinding compromised material integrity and nest quality.
  • C3H mice built nests comparable to BALB/c mice when provided unprocessed nesting material.
  • Mice actively sorted bedding by particle size when nesting material was mixed into the substrate.

Conclusions:

  • Distributing unprocessed nesting material mixed with bedding substrate is beneficial for nest building.
  • Processing nesting material with bedding is detrimental to nest integrity and construction.
  • Husbandry practices should prioritize unprocessed nesting material for optimal laboratory mouse welfare.