I'm getting a bit concerned about next week's heat myself. My birds did okay during that hot spell a week ago. This time they're predicting an even hotter 116 degrees in my location, and my yard usually runs 4-5 degrees hotter than they predict. Gulp.
I have one hen who is relentlessly broody. She goes broody every year around this time. I've never been able to break her bloodiness. The quickest way to get her off the nest is to give her eggs and let her do her thing. She's a great mama. I had started to collect eggs to put under her but at 116-120 the eggs will cook even if she's sitting on them the whole time. Think I'll hold off giving her the eggs. Hope she survives next week.
If you'd still rather break her broodiness than give her eggs, have you tried giving her a baby aspirin mashed up and dissolved in her water? The technique was suggested to me by a long-time, sagacious poultry keeper who explained that broodiness was accompanied by a rise in body temperature akin to having a fever, and the aspirin breaks the fever. I managed to successfully break my most persistent broodiest broody after more than two weeks of trying other techniques without success. I isolated her in a cage at night with aspirin treated water, and then gave her a second dose the following night. After that, she resumed laying for about 6 weeks before becoming broody again, which happens to be her cycle.