140 Report of the Department of Bacteriology of the 



A comparative study of the results obtained from the bacterial 

 and the cell counts is very interesting. Some of the facts which 

 have been noted are as follows: 



a. In the case of nine cows whose udder flora was studied and 

 whose cell count was higher than 1,000,000 cells per cubic centi- 

 meter, six showed a bacterial count higher than 500 per cubic centi- 

 meter in one or more quarters (i. e. Cows Nos. 7, 37, 242, 329, 616, 

 781). 



b. Of the eleven cows which showed 500 or more bacteria per 

 cubic centimeter in one or more quarters of their udder (i. e. Cows 

 Nos. 7, 37, 242, 329, 407, 507, 510, 616, 729, 781, 806), the lowest 

 cell count was 640,000 cells per cubic centimeter (Cow No. 507, a 

 three-teated cow). Five of these cell counts were lower than 

 1,000,000 and six were higher than 1,000,000. 



c. However, three cows with high cell counts showed low bacterial 

 counts; i. e., Cow 608 with a cell count of 1,210,000 and bacterial 

 counts of 37, 28, 34 and 14 respectively in each quarter, Cow 733 

 with a cell count of 1,370,000 and bacterial counts of 0, 3, 78 and 350 

 respectively, and Cow 803 with a cell count of 3,870,000 and bacterial 

 counts of 0, 6, 20 and 7 respectively. The last cow had next to the 

 highest cell count of any animal in the herd. 



d. In the nine cows with cell counts under 200,000 per cubic 

 centimeter whose udder flora was determined (Cows Nos. 307, 414, 

 421, 429, 610, 682, 800, 801 and 804), twenty-six out of the thirty- 

 six quarters gave bacterial counts under ten bacteria per cubic centi- 

 meter, and only two quarters showed bacterial counts higher than 

 eighty per cubic centimeter, i. e. ; 125 in the left hind quarter of Cow 

 414, and 430 in the right front of Cow 804. The total count for all 

 four quarters was less than 450 in every one of the nine cows. 



It is clear from the above data that a high cell count is not always 

 caused by a rich bacterial infection of the udder. There is, however, 

 some indication that a rich bacterial infection causes a high cell 

 count, but the records are inconclusive. Further records bearing 

 on this point are given on pages 150-3. 



The interpretation of the data from the qualitative standpoint 

 is almost impossible because of the confusion which exists in the 

 classification of the Coccaceae, to which a majority of the udder 

 bacteria belong. It should be noted that the udders of almost 

 all of the cows were infected with micrococci very similar to 



