Interesting idea but I call BS on this. First the cows would not be able to function. Second how would anyone know what the cows are really seeing? They don't have the same visual system as us. Third this is just the type of story that would go viral without much proof. I suspect some where there are a couple of Russians laughing their asses off knowing that they were able to pull this joke on everyone.
There were no studies. One cow in one farm has been fitted. No data on mill output.