DAIRYING 



21 



166. Some of the variations that may occur in the per cent, of 

 fat in the milk of one cow from one milking to another is shown 

 by the following figures taken from the records of six cows whose 

 milk was weighed and tested each day during an entire milking 

 period. 



Extreme Results Obtained During One Milking Period. * 





These figures show that with nearly all cows there is some 

 one milking during the year when the per cent of fat is very 

 different from the normal figure for that cow. It has been no- 

 ticed also that such extreme variations in the per cent of fat 

 are much more common with some cows than with others, depend- 

 ing largely on the nervous disposition or individuajity of each cow. 



167. The way in which two cows will differ in the amount of 

 variation that may occur in their milk when in the same herd 

 and with the same treatment is shown by the following figures. 



Illinois Bui. No. 24. 



