Cattle have a tendency to stay on flat areas of the landscape.  When comparing the hillshading image with the Landsat TM image we can see that to be the case.  In the top of the hillshading image we can see the landscape flattens out, and this is where the grazing is the heaviest.  The left-central portion of the Landsat TM image also shows an area with a high amount of bareground.  This corresponds with more slope than the top of the hillshading image but still less than the rest of the image.  The right-central portion of the Landsat TM image shows the least amount of heavily grazed areas and this corresponds to a large difference in aspect of the topography.