Scratching posts for cows mandatory in some countries

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I saw a video clip the other day of dairy cows grooming themselves with mechanical brushes which were installed in their pens. Most animals enjoy having a good scratch and will use trees, fence posts or just the ground to relieve an itch. However cattle that are confined to a barn are often unable to enjoy the luxury of a good old scratch. In my photo, taken in Innsbruck Zoo, you can see that two scrubbing brushes have been set up for the cows. These look like they would work well. However brushes can now be purchased which look like the small bristled rollers that you might see in a car wash. When the animal starts pushing against the brush it starts rolling. There are several YouTube clips of cows really enjoying the massaging/brushing sensation of the brushes. Researchers at the University of British Columbia say the cows spent an average of seven minutes a day utilising the brush and were willing to push through a weighted barrier to gain access to it. And it seems providing cows with the wherewithal to promote coat care is mandatory in some countries so I was a bit surprised to read that.