Most people eat way too much salt, then wonder why they get high blood pressure or swollen feet and legs. But overworking in high heat can lead to sweating out too much salt, resulting in a chemistry imbalance and possible death. Salt is part of a chicken's body chemistry the same as it is for humans. Without it, they will die. Too much and they will also die. A little salt goes a long way. Don't add salt to your chicken feed because it's already in the crumbles or pellets. We make mash and some of our leftovers already have salt, but I sure don't add more. If it's hot, use vitamin and electrolyte water instead. Some brands even have probiotics. Agrilabs brand "Vitamins and Electrolytes Plus" is a real lifesaver is hot weather.
Also dangerous: Soy. After I read the tropical bird study regarding infertility, malaborption, and gut scarring on Dr. Mercola's website, I cut soy from our diet too. I still have TVP for emergencies but won't eat it unless we run out of everything else.
Next topic for debate: feed containing diatomaceous earth. I saw a post on the Ameraucana page of FB from a woman whose mother or mother in law died from eating it over an extended period of time. It shredded her stomach lining. So no more DE for our chickens until this is verified.
I so agree with you as I have lost more birds this summer then I have in the last 15 years here in Death Valley Ca.