84 



VARIATION or- I'AT IN MILK AND CK]';AM 



cent milk produces 40 per cunt cream. ChdiiLjes in the richness 

 uf milk cause chanties in the richness (jf the cream. An^' condi- 



EFFECT OF RICHNESS OF MILK UPON THE CREAM 



100 LBS. OF 3'/ MILK 

 CONTAINS 3 LBS. OF FAT 



1 O LRS. OF CREAM = 3 LES. OF FAT 

 TLbT OF CREAM =20;; 



^ J ^ 1 = 2 ;; 



100 LES. OF 4.5;-; MILK 

 CONTAINS 4.5 LBS. OF FAT 



as LBS. 



3KIM-MILK 



lOO LBS. OF 6i MILK 

 CONTAINS 6 LBS. OF FAT 



35 LBS. 

 SKIM-MILK 



15 LES-OF CREAM = 

 TEST OF CREAMS 

 T5 '. 1 00 - 30^ 



S.OF FAJ: 15 LC&.OF CREAM- 5 LBS. OF FAT 

 TEST OF CP.EAM - 4 ;.' 



Fig. 14. 



tion, therefore, that affects the richness of the milk will also influ- 

 ence the richness and the test of the cream. 



Conditions that May Cause Changes in the Richness of the 



Milk. — During the early summer months the milk is usually 

 comparatively low in butter-fat. This is caused b}- such factors 

 as the freshening of the cows, change from dry feed to succulent 

 pasture and a natural and inherent tendency of the cows toward a 

 decrease in the richness of their milk in early summer. Toward 

 fall and early winter the opposite is the case. The advanced slate 

 of the period of lactation and the change fron^i succulent to dry- 

 feed cause the milk to become richer in fat. It is ob\-ious, there- 

 fore, that in the fall and winter the cream test tends to be higher 

 than in spring and earl}- summer. 



Again, it frec|uently happens thai e^'en in winter there is a 

 suflden droj) in the cream test. This may be due to the fact 

 that some uf the cows Ait'lding rich milk dr\- up or that some cows 

 come in fresh nr a new animal may l)e 1)rnught into the herd. 



The seasonal variations in the richness of the cream may be 

 reduced by turning out the cream screw a trifle in the fall and by 

 turning it in during the spring of the }'ear. 



