94 Bulletin 152. 



excess is 1.13 hours. The general averages of all the hours in 

 each case gives an average of 7.16 hours between milkings where 

 the highest per cents of fat w^ere found and 9.16 where the low- 

 est per cents of fat were found, or a difference of two hours. 

 According!}', we may say that, as a rule, the highest per cent of 

 fat follows the shortest period between milkings, and the lowest 

 per cent of fat follows the longest period between milkings. 

 However, looking only at the table of highest per cents of fat 

 we see that the greatest number of highest per cents comes at 

 noon, notwithstanding the fact that the average period from 

 morning to noon is nearly an hour longer than the average period 

 from noon to night. In the table of lowest per cents of fat it is 

 to be observed that the lowest per cent occurs only one-half as 

 many times at noon as at night, although the number of hours 

 from each previous milking averages practically the same. Tak- 

 ing all these fact into consideration, it w^ould seem that there is a 

 tendency for the milk to average higher in fat at the noon hour 

 than at any other time of da}'. 



An interesting study bearing on this point is found in Table V. 

 Twenty-two of the cows, w^hile on test, were milked as nearly as 

 possible at exactly equal intervals, eight at intervals of eight 

 hours each and fourteen at intervals of six hours each, or four 

 times daily. This table is arranged in two main divisions, one 

 for highest per cents of fat and one for low^est, and under each 

 division is given the time of day at which the milking was done. 

 Then in the appropriate column, opposite each cow's number, is 

 given the number of times during the week that she reached the 

 highest and lowest daily per cent of fat. 



