1904.] PUBLIC DOCUMENT — No. 33. 51 



It is desired at this point to again call attention to the 

 important fact that cow Foil}- in Herd I. became suddenly 

 ill between the first and second periods, and had to be per- 

 manently removed from the experiment. It was thought 

 best, however, to continue the experiment as planned, rather 

 than attempt to start again. 



It will be seen, in observing the above tables of analyses, 

 that in the first period, with five cows in each herd and both 

 herds receiving the same ration, the composition of the milk 

 was quite similar. This was, of course, due to the fact that 

 the two herds had been evenly matched. The milk yield of 

 both herds in this period was also essentially the same, 

 namely, 2,243 pounds for Herd I. and 2,292 pounds for 

 Herd II. 



In the second period, because of the loss of Folly, it was 

 not possible to make a comparison of the composition of the 

 milk produced by the two herds ; hence it was sampled 

 only during the last three weeks, in order to secure a basis 

 of comparison for the two folloAving periods. In this period 

 the relation of fat to solids not fat was 1 : 1.70 and 1 : 1.79 for 

 herds I. and II. respectively. 



In the third or corn oil period the composition of the milk 

 produced by both herds is given for the two preliminary 

 weeks as well as for the period proper, although the former 

 is not included in the average. The results show that the 

 milk produced by Herd I. remained quite constant in compo- 

 sition during the entire period. A slight decrease only in the 

 fat percentage is noted, the relation of the fat to solids not 

 fat being as 1 : 1.77. In case of Herd II. the fat percentage 

 suddenly increased from an average of 5.25 to 5.40 during 

 the preliminary period of two weeks, when the corn oil was 

 being added to the ration. The relation of fat to solids not 

 fat during the preliminary period was as 1 : 1.72. The effect 

 of the corn oil appeared to have been lost after two weeks, 

 for during the first week of the period proper the percentage 

 of fat was 5.10, and it declined slightly during the period, 

 with an average of 5.03 and a relation of fat to solids not fat 

 of 1 : 1.81. While the total solids did not change during the 

 preliminary period, they showed a decrease at the close of 



