One of the quickest remedies to high summer temperatures is the addition of salts into the feed and water of affected birds. The most commonly used salts include ammonium sulfate, sodium bicarbonate, potassium chloride, and sodium chloride.
A quick glance at scientific literature and technical publications will reveal that these salts definitely work, but inclusion levels and combinations are far from standardised.
I have had good results with sodium bicarbonate and potassium chloride, and especially with a combination of the two, in both broilers and layers.
What do you think about this ‘summer’ practice and how common is it in your country?