Lucky cows with their own bath and the cow even looked as if she was turning on the tap!  I suspect there must be some valve which is pressed to release water from the water tank.   The farmer showed me a calf which had to be bottle fed twice a day because its mother had no milk so had been kept in the barn during its six weeks life in order to try to form a bond with its mother before it was released into the fields with the new calves. There were many calves in the field and it was good to see them after seeing them confined to the barns and yard for so long.