A STUDY OF RATIONS FED TO MILCH COWS. 



83 



received a supplemental ration of the protein mixture, the 

 amount of the latter varying according to the yields of butter 

 fat. The plan of grouping the cows according to yield and 

 the daih^ quantity of protein mixture and of protein fed per 

 cow in each group in 1900 were as follows: 



Table 41. 



Daily yield of butter fat per cow in the different groups, and 

 amounts of protein fed. 



In each of two herds there were three groups, in one herd 

 four groups and in one herd five groups. Group A in each 

 herd was the one receiving only the basal ration. In two 

 herds the cows included in this group were those producing 

 .50-. 65 pound of butter fat per day; in the two other herds 

 those producing .50-. 70 pound were put in group A. The 

 daily quantity of digestible protein per cow in the basal ration 

 varied somewhat for the different herds but was very uniform 

 for all the cows in the same test. In two cases it was about 2 

 pounds, in one it was 1.6 pounds, and in the other 2.5 pounds. 



THE DETAILED DATA OF DAIRY HERD TESTS OF 19OO-190I. 



The detailed data of the dairy herd tests for the winter of 

 1900-1901 are given in Tables 44-51 beyond. There are two 

 tables for each herd. The first table gives the statistics of the 

 herd, including the breed, age, and estimated weight of each 

 cow, the number of months since last calf, and, when known, 

 the number of months till due to calf. It also includes the 

 average daily yield of milk and butter fat and the daily per- 

 centages of fat in the milk for the first and second tests. The 



