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Methods for Studying Factors that Influence the Sanitary Condition of Milking Machine Teat-cup Liners^{1, 2,}

Kansas Agricultural Experiment Station, Manhattan

ABSTRACT

Reports on milking machine sanitation frequently indicate that the physical condition of the rubber parts is important in achieving satisfactory results from a bacteriological standpoint. These references apparently pertain to obvious conditions such as freedom from gross dirt, milkstone, cracking, swelling, and softening of the rubber. More recent reports (1, 2, 3) suggest renewed attention to the rubber as a special harbor of bacteria. Jensen and Bortree (7) consider that, under practical conditions, bacteria in teat-cup liners may be lodged in the pores of the rubber. It seems possible that rubber liners, even though in apparently acceptable physical condition, may possess characteristics that are important in sanitation problems. Therefore, consideration should be given to such possibilities in methods used for investigating problems in milking machine sanitation.

For determining the bacteriological conditions of milking machines Rnehle et al. (12) devised the "artificial udder" method, which was used subsequently by others (4, 5, 9 ,10).

¹ Contribution No. 217, Department of Dairy Husbandry.

² This study was supported by funds provided under the Research and Marketing Act of 1946.