In microisolation cages, which factor affects the temperature and humidity level?

In microisolation cages, which factor affects the temperature and humidity level?

• A. Position of the cage in the rack
• B. Time since the last cage cleaning
• C. Type of plastic used in the cover
• D. All of the above

Answer: (B)

The main factor at play is the moisture dynamics inside the cage, which are most directly affected by how recently the cage was cleaned. Cleaning introduces or removes moisture and residues, and as time passes since the last cleaning, animals’ respiration, urine, and other waste continually add moisture to the microenvironment. This buildup can raise humidity and can also influence the temperature feel inside the cage due to changes in evaporative cooling and heat exchange, making the time since the last cleaning the most influential factor for the cage’s internal environment. While where the cage sits in the rack can cause small differences in airflow and the plastic cover material can alter some heat and moisture transfer, these effects are generally secondary in the controlled setting of a microisolation system. The cleaning interval directly ties to the cage’s internal moisture balance, which is why it’s identified as the key factor here.

The main factor at play is the moisture dynamics inside the cage, which are most directly affected by how recently the cage was cleaned. Cleaning introduces or removes moisture and residues, and as time passes since the last cleaning, animals’ respiration, urine, and other waste continually add moisture to the microenvironment. This buildup can raise humidity and can also influence the temperature feel inside the cage due to changes in evaporative cooling and heat exchange, making the time since the last cleaning the most influential factor for the cage’s internal environment.

While where the cage sits in the rack can cause small differences in airflow and the plastic cover material can alter some heat and moisture transfer, these effects are generally secondary in the controlled setting of a microisolation system. The cleaning interval directly ties to the cage’s internal moisture balance, which is why it’s identified as the key factor here.