The level of bacterial contamination of the surfaces of the milk piping systems of the UDM-200 milking unit (thousand pieces per cm²): 1 – bath; 2 – collector; 3 – the beginning of the first line of the milk pipeline; 4 – end of the first line of the milk line; 5 – the beginning of the second line of the milk pipeline; 6 – end of the second line of the milk line; 7 – milk dispenser; 8 – milk receiver; a is the upper limit of the level of bacterial contamination of equipment; b – the upper limit of the level of bacterial contamination of milk in the EU; c – the upper limit of the level of bacterial contamination of milk in the Russian Federation.