There is no official source for the person who officially discovered cow milk as cow milking has been an ancient practice associated with the very beginnings of agriculture development more than 8,000 years ago. However, the practice was very common in Europe and the East, in particular, and cow breeding was found to become popular when farmers began to discover that certain cows produced milk better than others.
In time, these cows were bred through many generations. Today, these types of cows are now known as dairy cows, specifically because they are known to produce a large amount of milk consistently. Most dairy cows are known as Holstein, recognized by their black and white spots.