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Cage ammonia levels during murine reproduction
1AFRC Institute for Animal Health, Pirbright Laboratory, U.K.
Journal of Experimental Animal Science
|January 1, 1991
Summary
Mouse housing conditions significantly impact ammonia levels. Larger cages (RM2) reduced ammonia exposure for mice compared to standard cages (M2), especially for outbred CD-1 mice, highlighting the need for adequate housing space to maintain safe ammonia levels.
Area of Science:
- Laboratory animal science
- Environmental health
Background:
- Ammonia accumulation in animal housing can pose health risks.
- Previous studies have not fully quantified ammonia levels in relation to cage size and mouse strain.
Purpose of the Study:
- To investigate the effect of cage size on ammonia levels in mouse housing.
- To compare ammonia exposure in inbred BALB/c and outbred CD-1 mice.
Main Methods:
- Monogamous mouse pairs (BALB/c and CD-1) were housed in standard (M2, 330 cm2) and larger (RM2, 676 cm2) cages.
- Ammonia levels were measured over a four-day period before litter weaning.
- Ammonia gradients within cages were assessed.
Main Results:
- Standard M2 cages resulted in mean ammonia levels of 26 ppm (BALB/c) and 154 ppm (CD-1).
- Larger RM2 cages significantly reduced mean ammonia levels for CD-1 mice.
- Ammonia levels in M2 cages exceeded human occupational exposure limits (25 ppm).
Conclusions:
- Cage floor area is a critical factor in controlling ammonia levels in mouse housing.
- Outbred CD-1 mice housed in standard cages experienced ammonia levels far exceeding safety guidelines.
- Optimizing cage size is essential for improving the welfare and health of laboratory mice.