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Growth of Certain Organisms of Importance to the Dairy Industry on New Standard Milk Agar^*

Kansas Agricultural Experiment Station

ABSTRACT

The medium used for making counts on milk and other dairy products, which became official July 1, 1939, has created considerable interest as to the effect it will have on dairy control practices. This paper deals with the relative amount of growth of certain pure cultures of bacteria on the old and new standard agars together with the total number of colonies as determined with these two agars on milk samples collected aseptically from an experimental dairy herd. The animals in the herd were divided into three groups: Those known to be free of streptococcic mastitis; those suspected of the disease because of high leucocyte counts; and those with clinical evidence of the disease and with long chained streptococci in the incubated milk.

RESULTS WITH PURE CULTURE STUDY

The pure cultures used were a series of pathogenic and non-pathogenic Gram-positive cocci and bacilli of importance to the dairy industry. These organisms were examined carefully for purity and identified.

^* Contribution No. 193, Department of Bacteriology.