92 



Bulletin 152. 



III, of those whose tests began from 31 to Sedan's inclusive ; and 



IV, of those whose tests began more than 60 days from calving- 

 It should be added that of the 47 tests which began more than 

 60 daj'S from calving, all but 10, or over two-thirds, were 90 days 

 or under. 



The averages of each group are given below, together with the 

 general averages of all ages and the average of all cows taken 

 together. 



TABLE IV. 

 Average Per Cents of Fat. 



o 



u 



bo 



o 



I Cows tested i to 15 days 

 from calving 



II Cows tested 16 to 30 days 

 from calving 



III Cows tested 31 to 60 days 



from calving 



IV Cows tested more than 60 



days from calving 



Average of all 



Two- 

 year 

 olds. 



Three- 

 year 

 olds. 



Four 



year 



olds. 



No. 



9 



8 



II 



7 



35 



Avg. 



per 



cent. 



3-30 



3-07 

 3.06 

 3.22 



3-13 



Full aged 

 cows. 



No. 



9 



16 



22 

 16 



63 



Avg. 



per 



cent. 



Average 

 of all. 



No. 



2.94 29 



3.38' 58 

 3.07 76 



Avg. 

 per 

 cent. 



3-23 



47 



3.17 210 



3.20 



3-24 

 3.06 



3.20 



3.16 



A glance at this table will show that question i is not answered 

 so far as all the cows are concerned. The smaller number tested 

 from one to fifteen days from calving ma}' reduce the importance 

 of the comparison, but in all ages except two-year olds the fig- 

 ures can be considered fairl}' representative. Two-year olds gave 

 the highest average per cent of fat in groups II and IV, three 

 and four-year olds gave their highest average in group I, and 

 full aged cows in group II. All except full aged cows gave the 

 poorest milk when the test began in group III, and these find 

 their lowest average in group I. With the exception of group 

 III, all of the groups average practically the same for all ages. 

 More cows were tested in group III than in any other group, 

 which may give more weight to the figures of this group ; but 

 considering the data at hand there does not appear to be any 



