PRODUCTION OF MILK OF LOW BACTERIAL CONTENT. 



41 



Fig. 21. — Interior of barn at farm No. 178. 



the average counts. Figure 22 shows graphically the summarized 

 and average results of the series of samples from each farm before 

 and after the three essential factors were introduced. It will be noted 

 that among the six farms some produced milk of a relatively low 

 bacterial content. Milk produced from farms 20 and 43 under the 

 ordinary conditions showed, respectively, average counts of 15,050 

 and 34.861 bacteria per cubic centimeter, while after the introduction 

 of the three essential factors the count was reduced to 4,656 and 

 2,050, respectively. The greatest average decrease due to the intro- 



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Pig. 22. — Average bacterial content of night's milk, produced on farms near Grove City, 

 Pa., before and after using the three most essential factors for the production of milk 

 of low bacterial content. 



