You're right to be proactive—extreme heat can be tough on chickens, especially younger pullets- EE especially due to their comb size unfortunately. You're already on track with the water, and I’d recommend having multiple clean sources, ideally in shaded areas.
Here are some additional tips for keeping them cool:
- Shade, shade, shade: Tarps, umbrellas, or even leaning boards can help create cooler microclimates.
- Frozen treats: Offer frozen fruits or veggies (like watermelon or peas) or freeze water in containers- then I put it out and let it defrost.
- Ventilation: Make sure your open-air coop (as well as the roosting area!) has strong airflow. Fans (safely secured and out of reach) can really help in stagnant conditions. I purchased some mini solar fans for coops- helps in many situations.
- Dust baths: A cool, dry dusting area where you start the hole- helps them regulate body temperature.
- Wet ground spots: Some people like to lightly hose down part of a shaded area so the birds can cool their feet—just make sure it’s not creating mud or standing water that attracts pests.
- Misting (if humidity allows): Light misting on the ground (not directly on the birds unless they approach it) can help lower ambient temps—though in SC’s humidity (I live in the Virgin Islands- so I get it), this can sometimes make things worse, so test it carefully.
As for the
open-mouth breathing (panting): you’re absolutely right—it’s a normal cooling behavior, especially if they’re also holding their wings out a bit.
Gapeworm, on the other hand, is fairly rare and usually comes with extra symptoms like repeated yawning, coughing, neck stretching, gurgling, or distress even in cooler parts of the day.
If you're unsure, observe them early in the morning or after sunset—if the panting stops when it's cooler, it’s heat-related. If it continues regardless of temperature, you might want to look into a fecal test or vet check.
You're clearly paying great attention to your flock—and that makes all the difference during these tough summer stretches!