As far as the murder part goes, dairy cows are mostly all killed very quickly after they stop producing milk. They are almost never allowed to live out their full lives. Especially, none of the cows in the larger dairy industry. The calves produced in the process are also just raised to be slaughtered. Besides the murder, The act of farming dairy products is also just cruel and inhumane in practice.

To produce milk, cows have to be kept in a pretty much constant state of pregnancy. Once the calves are born, they are immediately taken from the mother, and it is known that cows have maternal instincts that makes this painful for them. They have to be taken away, because otherwise they will drink the milk we are trying to steal from the process. Then the calf’s are raised in isolation for the first few months of their life on a milk substitute.

That is the bare minimum amount of cruelty needed to produce milk. Obviously, our modern capitalist driven dairy industry ramps up the cruelty in many other ways to increase productivity and efficiency.