48 



MANUAL OF MILK PRODUCTS 



ceding table. The figures in this table represent results secured 

 in both New York and Wisconsin." 



Variation of Fat in Cheese-factory Milk with Advance of 



Lactation 



Month 



April . . 



May . . 



June . . 



July . . 

 August 

 September 



October . 



Pek Cent of Fat 

 in Milk 



New York 



Wisconsin 



3.43 



3.48 



3.58 



3.49 



3.64 



3.50 



3.62 



3.55 



3.84 



3.63 



3.98 



3.84 



4.23 



4.08 



Percentages in Com- 

 parison with First Month 



New York 



100.0 

 104.4 

 106.1 

 105.5 

 112.0 

 116.0 

 123.3 



Wisconsin 



100.0 

 100.3 

 100.6 

 102.0 

 104.3 

 110.3 

 117.2 



Variation from day to day in herd milk. 



Since the composition of milk from the different breeds and 

 from individual cows varies decidedly, it is reasonable to expect 

 more or less variation in the milk from different herds. Not 

 only is this true, but there is also variation in the fat- content of 

 milk from the same herd from day to day. Daily variations 

 will normally be larger in herds where but few cows are 

 included than they will be in large herds, but in herds of 

 average size there will normally be daily variations in the per- 

 centage of fat. 

 Variations from day to day in individual cow. 



Individual cows will sometimes show very marked variations 

 in both the percentage and amount of fat from milking to milk- 

 ing. An extreme example of this variation is given by Fraser in 

 a two-day record of a cow being milked three times daily on 

 official test where the cow appeared to be in perfect health 

 and with no apparent cause for the wide variation. 



