I have a permanent feeder for my beef cows and calves. With all the rain we've had, we're thinking about putting down some gravel where they stand to eat. Since my husband built the feeder, the ground is 6-8" lower because of all the mud and of course, the cows stir it up when they eat. I feed them once a day, so am wondering if standing on gravel for a short time each day will damage their hooves and/or legs. Thanks for any information you can give.