A cow's life
At least half of the 10 million cows bred to be milked in the United States live on factory farms in conditions that cause tremendous suffering to the animals. Do not spend hours grazing in fields, but live crowded into pens or milking stalls with concrete floor, where they are milked by machines two or three times a day.
Milking machines often cause them to cuts and wounds that would not occur if the milking was manual. These wounds promote the development of mastitis, a painful bacterial infection. More than 20 different kinds of bacteria causing the infection that spreads easily from one cow to another and if not controlled, can cause death.
In some cases, milking machines also cause electric shock as a result of voltage surges, the cows causing great discomfort, fear, immune system damage and in some cases, death. It is possible that only one farm lost hundreds of cows due to voltage surges. (9)