New York Agricultural Experiment Station. 173 



f. experiment to show the effect on the cell content of the 

 milk when the animals were milked first by hand and 

 later by machine. 



Two animals freshened during the period in which these studies 

 were made and the opportunity was taken to make a detailed study 

 of the changes in cell content of their milk during the first few days 

 of lactation. These observations are reported on pages 166-175. 

 After milking one of the cows, Chloe B. (No. 7), for seventeen and 

 one-half days and the other, Ruth F. B. B. (No. 25), for seven and 

 one-half days by hand, both were put on the machine. Records are 

 here given for the period just before and just after the change during 

 which time both cows were apparently discharging cells at a normal rate. 



Table XV. — Cell Counts of Two Cows Milked First by Hand and Later 



by Machine. 



Numbers given per cubic centimeter. 



Date. 



Chloe B. (No. 7). 



Number 

 cells. 



Milk. 



Ruth F. B. B. 



(No. 25). 



Number 

 cells. 



Milk. 



March 16. 

 March 17. 

 March 18. 

 March 19. 

 March 20. 



Lbs. 



HAND milked. 



*660,000 

 495,000 

 155,000 

 395,000 

 760,000 

 1,050,000 

 320,000 

 480,000 

 275,000 



t95,000 



65,000 



75,000 



125,000 



105,000 



110,000 



95,000 



MACHINE MILKED AT A VACUUM OF 14.5 INCHES. 



% Lbs. 



8.3 

 8.0 

 9.0 

 8.2 

 9.6 

 7.9 

 9.2 



Twenty-seventh milking, f Ninth milking. 



