A shade that is 20 feet x 30 feet is relatively easy to handle and move. Make the supporting frame a minimum of 12 feet. high, and narrow enough to move through gateways. Brace the frame as well. Portable shades are light weight, easily moved and provide an excellent means of maintaining clean areas. Trees provide better shade for cattle and need to be fenced off.
Fans circulate and exhaust air and are particularly helpful in holding areas.
The first recommendation is to minimize the time cows are in the holding area. The second is to locate fans across the holding area moving air parallel to the length of holding area and away from the parlor. Another possibility for many holding pens is to install an open ridge to exhaust hot air. Water sprinklers or sprayers located in feed lanes and holding areas promote evaporative cooling. Any water application in high humidity areas requires the use of fans for effective cooling, otherwise cows stand in a steam bath.