The problem is the prevalence of certain diseases in our current herds. The dairies keep increasing the temperatures in hopes that it will destroy the problem. Unfortunately, current research indicates that this is not the case. The move to higher temperatures has only created more problems. The real solution is proper herd management, which is a step the big dairies do not seem to want to take.

Also, as the times change and our many diversified dairies dwindle to a few mega producers, milk needs to be held for longer periods and shipped over longer distances. Ultra-pasteurization increases the shelf life, thereby increasing the profitability of the milk.