Batch pasteurizers are disclosed for processing milk, colostrum and other
dairy products. The pasteurizers comprise inner drums to contain the
processed liquid, an outer drum surrounding same and providing an annular
space for retaining a heating fluid (heated by an electrical heater), a
helical coil to carry cooling fluid through the heating fluid, a
motorized pump or impeller to agitate the treated liquid to optimize heat
transfer, and a control system to switch the heater on and off, actuate
cooling liquid flow and optionally, at least partially drain the heating
fluid to provide a temperature/time profile and close temperature
tolerance, all of which produce pasteurized products with adequate levels
of immunoglobulins to provide newborn animals with sufficient immune
function.