The temperature range in which an animal can maintain body temperature with relatively little additional thermoregulatory effort is called the _____ zone.

The **thermoneutral zone**, abbreviated **TNZ**, refers to the range in which an animal can maintain body temperature without the additional thermoregulatory demands associated with conditions outside that range. The assignment connects performance with being within the TNZ. It also presents a calf temperature range, but such figures should not be assumed to apply identically to pigs or all animal classes. **Key takeaway:** The TNZ is a useful framework for understanding thermal comfort and production.\n\n**Glossary:**\n- **Thermoneutral zone (TNZ)**: Range of environmental temperatures associated with relatively low thermoregulatory effort.\n- **Thermoregulatory effort**: Physiological or behavioral work involved in controlling body temperature.