Method for sanitizing udders and milking units

The present invention is directed to a method for sanitizing the udders and teats of cows and other milk-producing mammals, which may be carried out without substantially interrupting the milking process. The method involves the use of a solution of ozonated water, in a concentration of between 0.01 mg and 5 mg ozone per liter of water, preferably between 0.05 mg and 1 mg ozone per liter of water. The ozonated water may be sprayed on the teats and udders, or the teats and udders may be dipped in the ozonated water. The method is also effective in preventing mastitis and other diseases of the mammary glands, and may also be used for sanitizing various components of the milking units, such as the claws and the liners of the teat cups.