It means, you do not disrupt whatever the cattle are doing, whether they are grazing, traveling to and from water, etc.  A good example would be: there are many ranch roads that go directly to a livestock watering facility, water troughs, dirt tanks, etc. If the cattle are present and are watering or laying around the watering area, do not stop your vehicle to look for elk tracks, etc. as it will scare the cattle away from the water.  Simply slow down, drive by, and leave the cattle undisturbed.  Just use good judgment.