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The Value of Hypochlorite and Quaternary Ammonium Compounds, when Used in Udder Washes, in Reducing the Plate Count of Milk¹, ^,2

Department of Dairy Husbandry, The Pennsylvania State College, State College

ABSTRACT

The effect of various udder washes upon the plate count of milk was studied using two concentrations of chlorine, two concentrations of quaternary ammonium, and clean water. Milking was done with previously auto-claved milking machines and the raw milk plated on tryptone-glucose-extract-milk agar before growth could take place. No differences in count could be attributed to treatments. A large degree of variation was observed between individual cows. On 25 pairs of observations, no significant difference in counts could be observed between night and morning milkings.

¹ The experimental data in this paper are taken from a thesis presented by E. M. Kesler in partial fulfillment of the requirements for the degree of Master of Science in Dairy Husbandry, Pennsylvania State College.

² Authorized for publication October 31, 1947, as paper no. 1402 in the Journal Series of the Pennsylvania Agricultural Experiment Station.