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Observations on Mastitis in an Experimental Herd^*

ABSTRACT

There is probably no aspect of dairying that interests so many diverse groups as does mastitis of the dairy cow; producers, consumers and manufacturers of any milk product meet the varied questions it presents as to the quantity, the quality and the healthfulness of milk and its products. The disease has been studied in the usual herd rather than under experimental conditions. While much can be learned regarding many aspects of the trouble by studying it in the field, it is probable that other aspects can be studied only under experimental conditions. Few herds have been maintained primarily for such a purpose; the most ambitious of such experimental attempts is that started in 1935 by the Commonwealth of Australia, on which a preliminary report has appeared (1).

During the past decade the research work on animal nutrition at this station offered opportunity for the study of mastitis in three groups of milking cows under experimental conditions.

^* Published with the approval of the Chief of the Federal Bureau of Animal Industry and the Director of the Wisconsin Agricultural Experiment Station.

Assistance in securing many of the data reported herein was given by Dr. W. D. Pounden and Dr. G. R. Spencer, who were employed jointly by the University of Wisconsin and the Bureau of Animal Industry, U. S. Department of Agriculture.