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The Germicidal Efficiency of Lye and Chlorine Solutions for the Sterilization of Milking Machines and Cream Separators¹

Kansas Agricultural Experiment Station, Manhattan, Kansas

ABSTRACT

Milking machine tubing and teat-cups may be sterilized effectively either with chlorine solutions testing 100 p.p.m. available chlorine, or 0.3 per cent lye solutions, providing the solution rack method is used. When the immersion method is employed, the chlorine solutions are less satisfactory than the lye solutions.

Chlorine solutions proved to be a more effective sterilizing agent than lye when used as a disinfectant rinse for separators. The results indicate that chlorine solutions employed for this purpose should contain at least 200 p.p.m. available chlorine in order to insure effective sterilizing action. Little difference was noted in the bacteriological efficiencies of lye solutions testing 1.00, 0.75, and 0.50 per cent, respectively. Since exposure of separator discs to a 0.5 per cent lye solution tends eventually to corrode the surfaces its use cannot be recommended for sterilizating cream separators.

¹ Contribution No. 157, Department of Bacteriology, and No. 96, Department of Dairy Husbandry.