146 



Testing Milk and Its Products. 



tained 254 Ibs. of butter fat. Selecting every thirtieth 

 day of her record as testing day, the total production of 

 milk and fat is shown to be as follows: 



Production of milk and butter fat per day. 



The average daily production of the cow, according 

 to the figures given in the preceding table, was about 

 16 Ibs. of milk, containing .78 Ib. of butter fat. Multi- 

 plying these figures by 307, the number of days during 

 which the cow was milked, gives 4,912 Ibs. of milk and 

 240 Ibs. of fat. This is 132 Ibs. of milk and 14 Ibs. of 

 fat less than the total weights of milk and butter fat, as 

 found by the daily weights and tests, or 2.8 and 5.5 per 

 cent, less, for milk- and fat production, respectively. 

 This is, however, calculated from only ten single weights 

 and tests, while it required over 600 weighings and 300 

 tests of the milk to obtain the exact amount. 



Similar calculations from the records of the other 

 cows gave fully as close results, showing that quite sat- 



