Arrange the physiological and behavioral responses in the order a pig typically exhibits them as heat stress develops.

The sequence begins when heat production or environmental heat gain exceeds heat release. The pig first increases blood flow to the skin surface to support heat transfer. With continued heat challenge, respiratory responses such as panting and increased breathing may become evident. Feed intake can fall, with consequences for growth and production. This is a useful conceptual progression, although actual responses can overlap rather than occur as perfectly separate stages. **Key takeaway:** Heat load, thermoregulatory response, and reduced intake can form a pathway to lower productivity.\n\n**Glossary:**\n- **Heat load**: Heat that the animal must dissipate, from its own production and surroundings.\n- **Panting**: Rapid breathing associated with heat response.\n- **Production**: Outputs such as growth or reproduction.