Relationships of Leucocytes and Streptococci to Fibrosis of the Udder

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Abstract
To determine the relationship of the presence of streptococci and the number of body cells in freshly drawn milk to pathological conditions in the udder tissue, a herd of 71 cows was studied for 10 mos. No streptococci were found in the milk from any quarter which was free from fibrosis (indurations). Such milk never showed cells in excess of 150,000 per cc, or gave a positive reaction to brom thymol blue. In other words, milk from the truly normal udders did not contain streptococci or an appreciable number of cells. Cells in excess of 150,000 per cc. and streptococci in the milk obtained from these herds indicated that the milk had been secured from udders containing a demonstrable amount of fibrosis. Not all fibrotic udders, on the other hand, showed streptococci or cells in the milk, when studied 6 over a period of months. When more than 500,000 cells per cc. were found in any one quarter, streptococci were at some time noted in the same or some other quarter of the same udder during the lactation period. More than 500,000 cells per cc. in freshly drawn milk signified an infection in the udder.

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