Assistant Laboratory Animal Technician (ALAT) Practice Exam

What is the thermo-neutral zone (TNZ) temperature range for mice?

1. 20°C to 25°C

2. 23°C to 28°C

3. 26°C to 34°C

4. 30°C to 35°C

The correct answer is: 26°C to 34°C

The thermo-neutral zone (TNZ) is a range of ambient temperatures in which an animal can maintain its body temperature without needing to expend extra energy for thermoregulation. For mice, the established TNZ typically falls between 20°C and 25°C. This means that the correct range for mice to be comfortable and active without metabolic stress is generally around this lower range, making it more energy-efficient for them. While some variations may occur based on specific strains or environmental factors, the standard understanding is that mice thrive best within the 20°C to 25°C range. Situations that involve higher temperatures, such as those suggested in other options, may cause stress and require mice to expend energy on cooling mechanisms, which is not ideal. Therefore, the correct answer is centered on the fact that the healthy, efficient operating temperature range for mice is crucial in research settings and animal husbandry, ensuring their well-being and the integrity of scientific outcomes.