Little, if any, loss in the life of the shade will occur provided the material is tight. 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. For example, center three 36-inch fans across the front of the holding pen with banks of three every 25 to 30 feet down the length of the pen. 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.