25) milking procedure - Babcock Institute - University of Wisconsin ...

Dairy Essentials - Lactation and MilkingTable 1: Basic steps in cleaning milking equipment.StepWater Durationtemp (min.)Action and comments1-Pre wash 35 o to 45 o C Remove the bulk of the residual milk in the milking machine;“Pre-warm” the equipment for better action of the cleaningsolutions.2-Wash(alkalinedetergent 1 )3-Water rinsemin. 50 o Cmax. 75 o C10 A chlorinated product helps remove protein; the alkalinityremoves the fat, and a complexing agent (EDTA) prevents theformation of salt deposits depending on water hardness.(optional)4-Acid rinse 2 35 o to 45 o C 5 Neutralizes chlorine and alkaline residues (prolongs life ofrubber parts); prevents mineral deposits and helps preventmilkstones; kills bacteria.5-Water rinseWarm water helps the equipment dry faster.6-SanitationBefore using the equipment again, a sanitizing solution ofhypochlorite (200 mg per kg of water, or 200 ppm) reduces thenumber of bacteria on the equipment.1Examples of active agents in alkaline detergents: sodium hydroxide, sodium carbonate, trisodiummonophosphate, and polyphosphates. Dilution rate must be as indicated by manufacturer’s label.2Examples of acids: phosphoric acids or organic acids (acetic acid, citric acid, etc.). Most acid products containcorrosion inhibitors. Dilution rate must be as indicated by manufacturer’s label.Cleaning the outside of milking unitsWhen milking is finished, all visible dirtand milk deposits must be removed fromthe outside of the milking units and theflexible tubes by scrubbing and rinsing inclean water.Washing the pipelines and the insideof the milking unitsStrong flow turbulence of milk passingthrough a right angled pipeline and heatmay cause milk components (protein) toprecipitate and form “milkstones.”The basic steps to adequately clean amilking machine manually or with a“clean-in-place” system are summarized inTable 1. It is not possible to combine all thenecessary properties of a cleanser in onepreparation because elimination of fat andprotein film normally requires alkalinedetergent, whereas an acid solution isneeded for mineral deposits. Thusalternative use of alkaline detergents andacids is recommended. In addition, toassure the proper cleaning action of manydetergents, the following must also be partof the cleansing process:1) A mechanical action (manualscrubbing) or a high velocity flow(“clean-in-place” system) are neededfor a sufficient amount of time (contacttime) to lift and carry particles away;2) The total volume of water used mustbe sufficient to ensure contact betweenthe detergent solution and theequipment;3) The concentration of detergent mustbe adequate to obtain the desiredcleaning action;4) The water temperature must not betoo high or too low; temperaturedictates the effectiveness of manydetergents.100 The Babcock Institute