New York Agricultural Experiment Station. 143 



history. Nearly all of the animals had been tuberculin tested, 

 though the list is thought to include a few animals from the Mead- 

 ville herd which reacted to the tuberculin test soon after these tests 

 were made. The total number of these reacting animals could not 

 have been more than six. 



It will be seen that there is considerable difference between the 

 various herds so far as the cell content of their milk is concerned. 

 The Station herd gives an average cell count of less than half the cell 

 count of any of the other herds. The most noticeable difference 

 in the management of these herds which might have caused this 

 difference was that the animals in the Station herd had been milked 

 by machine during alternate lactation periods for four years previous 

 to the time when this test was made while the other herds had all 

 been milked by hand. The possibility that this difference in the 

 method of milking may have had an influence is supported by the 

 evidence given on pages 173-175. 



Of the 122 cows, 59 gave cell counts under 500,000 cells per cubic 

 centimeter, 36 gave cell counts between 500,000 and 1,000,000 per 

 cubic centimeter, while 27 gave cell counts higher than 1,000,000 

 per cubic centimeter. There is no evident difference between the 

 three groups of animals. Of the three cows which are known to have 

 suffered from udder troubles previous to the time of the test, one gave 

 a cell count under 500,000 and the other two gave cell counts between 

 500,000 and 1,000,000. The general average for the 122 cows was 

 808,000 cells per cubic centimeter. More than half of the cows 

 had cell counts higher than 500,000 per cubic centimeter. 



D. CELL CONTENT OF GOAT-MILK. 



During the course of present investigations, an examination was 

 made of the milk of nine of the goats kept at the Experiment Station. 

 The results of the examinations are given in Table VII. For com- 

 parison, the figures given by Breed and Stidger for two goats from 

 Gottingen, Germany, have also been included. The numbers of 

 cells found were uniformly high and in one case in particular 

 (No. 8) the milk was filled with enormous numbers of cell fragments 

 which made it impossible to determine the number of cells accurately. 

 The figure given represents merely an approximation. The average 

 cell content of the milk of the 11 goats was 7,465,000 per cubic 



