Add fat to the diet. Fat has a high energy density and will help maintain energy intake during reduced feed intake. Whole cottonseed, soybeans and commercial fat products are options. However, high moisture feeds spoil rapidly, so clean feed bunks daily. Feed cows frequently to stimulate intake and minimize heat load from digestion of a large meal.
Clean water troughs frequently and provide unlimited fresh water.
It may pay to keep cool well water cool using insulated waterers or by shading the trough. Minimize social stress by minimal regrouping. Move cows during cooler evening hours and avoid moving cows long distances, especially during the hottest part of the day. Remember to protect your dry cows too. Research shows that simply shading dry cows during the summer increased production during the following lactation.