l68 SCIENCE AND PRACTICE OF CHEESE-MAKING 



statement in regard to the influence of turning cows 

 from barn into pasture about the middle of May: 



First half of May. . . 

 Second half of May. 



Per cent 



of fat 



in milk 



3.46 

 3.70 



Per cent 



of casein 



in milk 



2.25 

 2.45 



Parts of casein for 

 one part of fat 



Fat: Casein 



1: 0.65 

 1: 0.66 



It is seen that under the conditions indicated, 

 the fat and casein maintain a relation that is very- 

 uniform. 



Turning now to data obtained during a summer 

 when extreme drouth prevailed during part of July 

 and all of August, we have the following results : 



EFFECT OF DROUTH UPON RELATION OF FAT TO CASEIN 



IN MILK 



Month 



May 



June 



July 



August . . . . 

 September 

 October. . . 



Per cent 

 of fat 



3.58 

 3.59 

 3.71 

 4.04 

 3.97 

 4.20 



Per cent 

 of casein 



2.40 

 2.33 

 2.20 

 2.26 

 2.47 

 2.69 



Parts of casein for 

 one part of fat 



Fat: 



1: 

 1: 

 1: 



1: 

 1: 

 1: 



Casein 



0.67 

 0.65 

 0.59 

 0.56 

 0.62 

 0.64 



These results show, for cheese-factory milks, an 

 abnormal ratio of fat and casein in July, which was 

 still further from normal in August. In Septem- 

 ber, when abundant rains came and when, in addi- 

 tion, dairymen had fodder corn to supplement 

 pastures with, the ratio became more nearly nor- 

 mal and still more so in October. From the stand- 

 point of practical -application, these facts indicate 



