Nope. As long as cattle have water, they can take any and all of the brutalized heat that the west can dish out.
They thrived on the open deserts, especially the Longhorns who roamed wild in Mexico and bred by the tens of thousands.
Evolution at work.
They weren't on the trains long. Traveling on the trains from from Dodge City, Kansas, or Sedalia, Missouri, to Chicago by rail was not an overly long trip. And, all major rail stops had cattle pens to unload the cattle, feed and water them.
The problem with open cattle cars would have been that cattle is spooked fairly easily, and if they decide to get out, then nothing can stop them. Thousands of pounds of muscle in one car, pushing against wooden slats.
Mannyrock
