52 Bulletin 152. 



only four were supervised by representatives from this Station. 

 On the other hand, during the succeeding years all but three of 

 the official records published from this State have been supervised 

 by representatives from this vStation. The men who have super- 

 vised these tests are Professors H. H. Wing and G. C. Watson, 

 and Messrs. J. M. Trueman, S. H.T. Hayes, R. L. Speed, J. M. 

 Johnson, Horace Atwood, Hugh C. Troy, A. R. Ward, H. C. 

 McLallen and Leroy Anderson. It is only from data obtained 

 by our representatives while conducting these official tests that 

 we have to deal in this bulletin. 



The method of conducting an official test is briefly as follows : 

 The person supervising sees the cow or cows milked dry before 

 the beginning of the test and is present at each milking there- 

 after until each test is completed ; he weighs the milk of each 

 cow separately, samples the same and makes a determination of 

 the butter fat by the Babcock test. He keeps a careful record of 

 each milking, with its per cent and amount of butter fat, and in 

 his report of the test must make an affidavit to the accuracy and 

 truthfulness of the same. The supervisor also keeps a record of 

 the kinds and amount of food eaten by each animal during the 

 test. The cows are wholl3^ under the control of the owner so far 

 as kind and amount of food, time of milking and general treat- 

 ment are concerned, but the person making the test has access to 

 the cows at all times in company with the owner or his repre- 

 sentative. The owner furnishes a statement of the name and 

 herd book number of the cow, her age and the time at which she 

 dropped her last calf. It is from data obtained in the above 

 manner that the tables contained in the following pages are 

 compiled. 



The first tests of Holstein-Friesian cattle conducted by repre- 

 sentatives from our Station were begun on May 30th, 1894, and 

 such tests have occurred at various intervals up to the present 

 time. Eight different herds have been visited and 210 separate 

 tests been made of 153 different animals. Some animals have 

 been tested twice and one as many as six times. From these 

 tests and the vast amount of data so accumulated, we believe that 

 something of interest and value can be deduced for the general 

 dair3-man as well as for the breeder of Holstein-Friesian cattle. 



