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  • Title: Microclimate in two types of rat cages.
    Author: Hirsjärvi PA, Väliaho TU.
    Journal: Lab Anim; 1987 Apr; 21(2):95-8. PubMed ID: 3599880.
    Abstract:
    The microclimate in two types of rat cages (a Makrolon type IV with a solid floor and a stainless steel cage with a wire mesh floor (five rats per cage)) placed in the same macro-environment was compared. The temperature, relative humidity and ammonia concentration in the cages were measured twice a day for 8 days. The cages were cleaned every 4 days. The greatest difference between the cage types was in the ammonia build-up. In Makrolon cages the ammonia concentration never reached 5 ppm, whereas in steel cages it showed a constant increase and already exceeded the threshold limit for man (25 ppm for 8 h per day) on the third day after cleaning.
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