178 



CITY MILK SUPPLY 



of Dairy and Milk Inspectors instances the results obtained in an Eastern 

 city of about 100,000 population where a comparison of 1,392 bacterial 

 counts from 484 dairies during the 5 years 1910, 1911, 1912, 1913 and 

 1914 showed that: 



47 dairies scoring over 80 gave an average count of 25,000 bacteria per c.c. 



46 dairies scoring 70 to 80 gave an average count of 98,000 bacteria per c.c. 

 334 dairies scoring 61 to 70 gave an average count of 352,000 bacteria per c.c. 

 711 dairies scoring 50 to 61 gave an average count of 470,000 bacteria per c.c. 

 254 dairies scoring under 50 gave an average count of 566,000 bacteria per c.c. 



But results do not always have this trend. High-scoring dairies often 

 yield milk of high bacterial count, and that low-scoring dairies must 

 necessarily yield high counts is untrue. 



Brainerd and Mallory, in 1911 studied the relation between the scor- 

 ings of 54 dairies on the card in use in Richmond, Va., and the bacterial 

 counts obtained on milk sampled at milking time at these same dairies 

 and plated from 1 to 3 hr. thereafter. The results appear in Table 51. 



TABLE 51. RELATION BETWEEN DAIRY FARM SCORES AND BACTERIAL COUNTS 



(BRAINERD AND MALLORY) 



From these experiments the authors concluded that it is possible 

 to produce good milk under conditions which would give a score below 

 any effective standard which might be established and that it is not 

 logical to condemn milk by a standard that bears no fixed relation to its 

 purity or sanitary properties. They held the chief defect of the score 

 card to be that, as a measure of the sanitary properties of milk, none of 

 the points scored have a permanent value under all conditions and it is 

 questionable whether they have a definite value under any given set 

 of conditions. However, they recognized the score card to be of the 

 greatest influence in improving the quality of milk and advocated its 

 use until some better method should be developed. They suggested 



