Do not crowd cows into holding pens or force them to crowd under limited shade. This only adds to the heat stress. Balance rations to account for reduced intake during hot weather. This means increasing the concentration of nutrients such as protein and energy. Balance minerals for hot weather feeding.
Research shows greater milk yield with potassium above current recommendations.
Deficiencies or excesses of certain nutrients make the cow less efficient. Make sure the ration is balanced for all nutrients. Consider reducing the fiber content of the diet. Be careful, because too little fiber causes digestive problems and lowers fat test. Use very high quality forages.