Anyone use a grate style of cattle guard (layed in ground instead of a fence mounted swing gate) for entrance onto their pasture/property? Would like to know what the effectiveness is as to keeping cattle in. Anyone have experience with cows managing to get across one? Would you say they are as reliable as a fence gate for keeping the cows in? I ask as it would seem to make entering/exiting a lot better for someone who would need to travel thru one gate multiple times a day.